This May, as of April 28^th, 106 sales with an estimated 20,000+ lots scheduled.  Dates occasionally change, others are added and a few delayed but the events as shown here are substantially what to expect.  The auction calendar, once the month is underway is always being updated.  At the end of this list is a link to the most up-to-date schedule.

Wed. May 1^st          Bonhams.  Prints [20911].  321 lots

                                    Christies.  Prints and Multiples [2697].  403 lots

                                    Swann Galleries.  Old Master through Modern Prints [2312]

Thurs.  May 2^nd          Bonhams.  Books, Prints [20647].  19 lots

                                    Eldred’s.  Asian Art – Prints [759].  28 lots

                                    Heritage Auctions [HA.com].  Rare Books internet bidding ending today [201318].  284 lots

                                    Kestenbaum and Company.  Fine Judaica, Hebrew Books, Manuscripts and Autograph
   Letters [58].  393 lots

                                    Sothebys.  Prints [N08986].  372 lots

Fri.  May 3^rd                Sothebys.  Prints [N08986].  372 lots

                                    Keys Fine Arts [1119].  167 lots

Sat. May 4^th                Neal Auction Company.  Prints [50413].  78 lots

Sun.  May 5^th              Neal Auction Company.  Prints [50413].  78 lots
Freeman’s [Samuel T. Freeman & Co.]  Prints [1458].
Bruun Rasmussen.  Old and Modern Prints [1319].

Mon. May 6^th              Zisska & Schauer.  Books [61].

Tues. May 7^th             Bonhams.  Photographs [20912].

                                    Burgerdijk & Niermans.  Books and Mapd [337].  1329 lots

                                    Zizzka & Schauer.  Books [61].

Wed.  May 8^th          Bonhams.  Roy Davids:  Part III:  Poetry [L-Z] [20923].

                                    Burgerdijk & Niermans.  Books and Mapd [337].  1329 lots

                                    Zizzka & Schauer.  Books [61].

Thurs. May 9^th           Bloomsbury Auctions.  The Botanical Library of a Continental Gentleman [36052].  288 lots

                                    Heritage Auctions [HA.com].  Rare Books on line bidding ends today [201319].

                                    PBA Galleries.  Fine Books in all Fields [506].

Sat. May 11^th              Guernsey’s.  John James Audubon Handsome Works of Nature [51113].  230 lots

Sun. May 12^th            Bonhams.  Books and Prints [20965].

                                    National Book Auctions.  Books [51213].

Mon. May 13^th           Bonhams.  Books and Prints [29065]

                                    Swann Galleries, Inc.  Modernist Posters [2314].

Tues. May 14^th           Ader.  Ancient and Modern Medicinal Books [20831].

                                    Ketterer Kunst / F. Doerling.  Old Masters and 19^th Century Prints [402].

                                    Lyon and Turnbull Ltd.  Rare Books, Maps and Manuscripts [378].

                                    Rupert Toovey and Co.  Antiquarian and Collector’s Books [1127].

                                    Sothebys.  Travel, Atlases, Maps and Natural History [L13401].

Wed.  May 15^th         Ader.  Ancient and Modern Medical Books – Collection of M. C. [20831]

                                    Autographes Encheres.  Autographs, Manuscripts, Historical Memories, Vintage Posters – auction ends today [21710].  148 lots

                                    Christies.  Photographs [1120].  108 lots

                                    Dominic Winter Book Auctions.  Printed Books, Maps and Documents [51513].

                                   ERA Encheres.  Collection of 60 Atlases, Esotericism, Manuscripts, Curiosa, Old Books, Varied [21730].

                                    Lyon and Turnbull Ltd.  Rare Books, Maps and Manuscripts [378].

                                    RR Auction.  Autographs [408].

                                    Rupert Toovey and Co.  Prints [1126].

                                    Tajan.  Russian Art – Ancient and Modern Books [21713].

                                    Coutau-Begarie.  Books on Textiles [51513].

Thurs. May 16^th         Bloomsbury Auctions.  Bibliophile [36042].

                                    Dominic Winter Book Auctions.  Historical, Aviation, Maritime and Transport Memorabilia [51613].

                                    Heritage Auctions [HA.com].  Comics and Comic Art [7076].

                                    Heritage Auctions [HA.com].  Rare Books – internet bidding ending today [201320].

                                    Piasa.  Ancient and Modern Books [206626].

                                    Swann Galleries, Inc.  Contemporary Art [2315].

Fri. May 17^th              Bloomsbury Auctions.  Photographs and Photobooks [36043].

                                    Coutau-Begarie.  Ancient and Modern Books [51713].

                                    Heritage Auctions [HA.com].  Comics and Comic Art [7076].

                                    Jeschke – van vliet Buch und Kunstauktionen GmbH.  Precious and Rare Books & Decorative Prints [90].

                                    Rossini.  A Century of Posters [21725].

                                    Gonnelli Casa d’Aste.  Prints, Drawings, Maps and Views [12].

Sat. May 18^th              Artcurial Briest-Le Fur-Poulain-F. Tajan.  Comic Strips [21446].

                                    Clars Auction Gallery.  Prints, Photographs [51813].

                                    Gonnelli Casa d’Aste.  Prints, Drawings, Maps and Views [12].

                                    Cottone.  Books, Ephemera, Prints [51813].

                                    Castner’s Auciton and Appraisal Service.  Photographs and Postcard Collection [51813].

                                    Eldred’s.  Prints, Books [784].

                                    Heritage Auctions [HA.com].  Comics and Comic Art [7076].

Sun. May 19^th        Bonhams.  Books, Prints [20966].

                                    Clars Auction Gallery.  Prints, Photographs [51813].

Wed. May 22^nd        Ader.  Ancient Books – Szapiro Collection [20842].

                                    Bonhams.  The Sporting Sale [20648].

Thurs. May 23^rd         Aguttes.  Books and Old Papers [20655].

                                    Bloomsbury Auctions.  Chinese Propaganda Posters [36054].  532 lots

                                    Hauff and Auvermann.  Part I.  Rare Books, Autographs and Engravings [70a].  693 lots

                                    Heritage Auctions [HA.com].  Rare Books – internet bidding ending today [201321].

                                    RR Auction.  Autographs [409].

                                    Swann Galleries, Inc.  Autographs [2316].

Fri. May 24^th              Ader.  Ancient and Modern Prints [20841].                     

                                    Hauff and Avermann.  Part II:  Rare Books, Autographs and Engravings [70b].  1119 lots

                                    Piasa.  Ancient,  Modern and VContemporary Photos [20627].

Sat. May 25^th              ERA Encheres.  Rare Prints of the XVI to the XIX, Very Fine Ancient Books about Lyon [21376].

                                    Hauff and Auvermann.  Part III:  Modern Literature, Posters and Photography [70c]

                                    Hauff and Auvermann.  Part IV:  Modern and Contemporary Art [70d].

                                    Morton Casa de Subastas.  Books, Documents and Engravings [52513].

                                    Northeast Auctions.  Historical Americana [52513].

Sun. May 26^th          Northeast Auctions.  Historical Americana [52513].

Mon. May 27^th           Dorotheum.  Modern and Contemporary Prints [52713].

                                    Ketterer Kunst / F. Doerling.  Books [405].

Tues.  May 28^th          Artcurial Briest-Le Fur-Poulain-F. Tajan.  Books and Manuscripts [20890].

                                    Bubb Kuyper.  Books, Manuscripts, Graphic Art [58].

                                    Jeschke – van vliet Buch und Kunstauktionen GmbH.  Prints [91].

                                    Ketterer Kunst / F. Doerling.  Books [405].

                                    Minerva Auctions Roma.  Paintings and Drawings of the XIX Century Art Books [ROMA-91].

Wed. May 29^th           Alde.  Letters and Manuscripts [20986].

                                    Bubb Kuyper.  Books, Manuscripts, Graphic Art [58].

                                    Dorotheum.  Autographs [52913].

                                    Sothebys.  Photographs [PF1310].

                                    Sothebys.  Books and Manuscripts [PF1303].

Thurs. May 30^th         Bloomsbury Auctions.  Important Book and Manuscripts [36056].

                                    Bubb Kuyper.  Books, Manuscripts, Graphic Art [58].

                                    Galerie Bassenge.  Prints [101h].

                                    Heritage Auctions [HA.com].  Rare Books – internet bidding ending today [2013222].

                                    Keys Fine Arts Auctioneers.  Books [53013].

                                    PBA Galleries.  South Sea:  The Library of Dr. Richard Topel, Part II [507].

                                    Profiles in History.  The Property of a Distinguished American Private Collector, Part II [53013].

Fri. May 31^st               Alde.  First Editions of the XIX and XX – Collection Tschann [21423]

                                    Bubb Kuyper.  Books, Manuscripts, Graphic Art [58].

                                    Galerie Bassenge.  Prints [101b].

                                    Keys Fine Arts Auctioneers.  Books [53013]

Link to current auction list and auction search.