Otto L. Bettmann Personal Papers Collection, 1976-1998. Special Collections; Florida Atlantic University Libraries, Boca Raton, Florida. Finding aid.
Pabst Brewing Company Collection. Milwaukee County Historical Society. Finding aid.
Pabst Brewing Company, Records (1873-197?). University of Wisconsin-Milwaukee Libraries, Archives Department. Finding aid.
Partners: A History of the Development of the Wyomissing Industries. Reading: The Wyomissing Industries, 1936.
Philipp Brothers Collection; AR 25131. Leo Baeck Institute, New York. Finding aid.
Potthast Brothers Collection, PP7. Maryland Historical Society Library, Special Collections Department. Finding aid.
Potthast Brothers, Inc. 1892-1975, Correspondence, 1933-34, n.d. Maryland Historical Society Library, Special Collections Department.
Potthast Brothers, Inc. 1892-1975, Letterbooks, 1908-32. Maryland Historical Society Library, Special Collections Department.
R.G. Dun & Co. / Dun & Bradstreet Collection. Baker Library, Harvard Business School. Finding aid.
Rath Packing Company Records, 1890-1985, MS 562. Special Collections Department, Iowa State University Library. Finding aid.
Records of B. Altman & Co. 1876-1955. The New-York Historical Society. Finding Aid.
Reminiscences of Gerard Swope, Interview by Harlan B. Phillips, 1955. Oral History Collection, Columbia University, New York, NY. Online catalog.
Roebling Collection, 1830-1926. Rensselaer Polytechnic Institute, Archives & Special Collections, Troy, New York. Finding aid.
Roebling Family Papers, 1821-1960. Special Collections and University Archives Rutgers, The State University of New Jersey, New Brunswick, NJ. Finding aid.
Rothschild Archive. London, United Kingdom. Finding aid.
Rudolph Kleberg Family Papers, 1829-1966. Dolph Briscoe Center for American History, The University of Texas at Austin. Finding aid.
Samuel Untermyer Papers. The American Jewish Archives, Cincinnati, OH. Finding aid.
Sanger Brothers Department Store Records, 1869-1966, 1989. Dolph Briscoe Center for American History, The University of Texas at Austin. Finding aid.
Schieffelin & Co. Records, 1796-1947. Hagley Museum and Library, Wilmington, DE.
Schieffelin Family Papers. Yale Collection of Western Americana, Beinecke Rare Book and Manuscript Library. Finding aid.