De Hauke & Co., Inc., kept extensive correspondence files that were broken down into major groupings similar to those of Jacques Seligmann & Co. There are seven separate sections to this subseries. Bernheim-Jeune Correspondence (Series 9.1.1) includes letters, contracts, and business transactions between de Hauke & Co. and Bernheim-Jeune, a leading European modern art dealer in the period between the wars. The two largest sections of this subseries, Domestic Correspondence (Series 9.1.2) and Foreign Correspondence (Series 9.1.3) reflect the efforts of de Hauke to cultivate and maintain international associates and clients. Museum Correspondence (Series 9.1.4) includes correspondence with art institutions and museums. Correspondence between staff of de Hauke & Co. and staff of Jacques Seligmann & Co. can be found in Inter-Office Correspondence (Series 9.1.5) and Jacques Seligmann & Co. (Series 9.1.6). Correspondence with art magazines and publishers of de Hauke & Co. exhibition announcements and advertisements can be found in Publicity (Series 9.1.7)