Julius Rosenwald. Papers. Special Collections Research Center, University of Chicago Library. Finding aid.

Julius Weltzien Files. SchA-B1-524 and SchA-B5-790, Schering Archives, Bayer AG, Berlin, Germany.

Klaw & Erlanger Collection. Shubert Archive, New York, N.Y..

Klein Chocolate Company: Fiftieth Anniversary 1913–1963. booklet, in “Chocolate Industry” folder, Information Files, Lancaster County Historical Society, Lancaster, Pa..

Kurt Enoch papers (1960-1978). Call no. MssCol 935, New York Public Library, Archives & Manuscripts. Finding aid.

Landor Design Collection, ca. 1930-1994. Archives Center, National Museum of American History, Smithsonian Institution. Online catalog.

Leading Manufacturers and Merchants of Cincinnati and Environs. Boston: International Publishing, 1886.

Lehman Brothers Collection. Baker Library, Harvard Business School. Finding aid.

Leo H. Baekeland Papers. Archives Center, National Museum of American History, Washington, DC. Online catelog.

Letters of Louis Wollenberg: Written in German during the Decade 1859–1869. comp. Charles M. Wollenberg. San Francisco: Grabhorn Press, 1941.

Lowenbrau AG Records, F2 (Löwenbräu AG, München), no. 6796. Bayerisches Wirtschaftsarchiv, München. Finding aid.

MA83-18 Sanger Harris Collection, 1880-1982. Texas/Dallas History & Archives Division, Dallas Public Library. Finding aid.

Mack Sennett Papers. Margaret Herrick Library, Academy of Motion Picture Arts and Sciences, Beverly Hills, California. Finding aid.

Mallinckrodt, Edward Jr., Papers, 1798-1981. S0452, State Historical Society of Missouri. Finding aid.

McAllister Collection, Franks-Gratz-Simon Papers. Historical Society of Pennsylvania, Philadelphia [HSP].

Mergenthaler Linotype Company records, MSS 520. University of Delaware Library, Special Collections Department, Newark, DE. Finding aid.

Milwaukee Brewers’ Association Records (1883-1894). University of Wisconsin-Milwaukee Libraries, Archives Department. Finding aid.

Moses Taylor Papers. New York Public Library, New York City, New York. Finding aid.

National Carl Schurz Association, Inc. Records, (Collection MSS 176). The Historical Society of Pennsylvania. Finding aid.

Neiman Marcus Archives, MA 82-5. Texas/Dallas History and Archives Division, Dallas Public Library.