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.
Schieffelin Family Papers, 1756-1907. Manuscripts and Archives Division, The New York Public Library, Astor, Lenox and Tilden Foundations. Finding aid.
Sears, Roebuck and Company Archives. Hoffman Estates, Illinois. Archives website.
Seligman family papers, 1862-1878. New York Historical Society, New York, NY.
Solms-Braunfels Archives, 1842-1957. Dolph Briscoe Center for American History, The University of Texas at Austin. Finding aid.
Sousa Press Books. U.S. Marine Band Library, Washington, D.C.
Spreckels Sugar Company Collection. University of California at Davis Special Collections. Finding Aid.
Steinway & Sons Collection. LaGuardia and Wagner Archives, Queens, New York. Online access.
Stiegel, Henry William, 1729-1785, Records of Manheim Glass Works 1763-[1773?]. Winterthur Museum, Garden, and Library, Wilmington, DE.
Straus Family Papers, 1810-1962. Manuscripts and Archives Division, New York Public Library. Finding Aid.
Syndicate Books of Drexel, Morgan & Co. and of J. P. Morgan & Co. The Pierpont Morgan Library and Museum, New York, NY, 1879-1918, Twelve Volumes.
"The Man Who Makes the Stamps Stick." Baltimore Sun Magazine April 21, 1929, 12.