The business papers document the full scope of Thomas Lamb's career and include client correspondence, notebooks, drawings, publicity files, personal writings, patents and publicity materials. Client files of particular interest include those relating to Lamb's contracts with Ellison & Spring, Lord & Taylor, Judson Mills, PARA Mfg. Co., the Lawton Company, Wear-Ever/Cutco and Good Housekeeping (Kiddyland). Products from his early career include draperies, napkins, tablecloths, shower curtains, floor coverings and the Kiddyland toys and cartoons.

The business papers also include magazine profiles of Lamb, files on the 1948 Museum of Modern Art show, childhood materials and notes from the 1920s, as well as autobiographica​l notes compiled in the 1970s and a eulogy by fellow designer Marc S. Harrison. There is also a group of writings from the 1940s that describe Lamb's ideas about the Second World War and foreign relations, including an unpublished essay, "A Way to American security," 1941.