The Charlotte Rumbold Papers Series comprises mostly correspondence to and from family members and colleagues from 1918 to 1937. The papers are arranged chronologically and include four letters from Roger Nash Baldwin, a prominent social activist who helped form the American Civil Liberties Union. The Caroline Rumbold Papers Series includes mostly correspondence to and from family members from 1918 to 1929. In the correspondence, their brother Frank Meeker Rumbold referred to his sister Charlotte as "Budge," and Caroline as "Toots" and "Tom." The Engelmann Family Papers Series includes typed translatations (from German) of letters of Lieutenant Adolph Engelmann to his parents during the Mexican War, 1846-1847. Charlotte Rumbold, a seventh-generation members of the Engelmann family, owned these family papers. The papers are arranged chronologically. The General Correspondence Series comprises letters from Charlotte's brother, Frank Rumbold, to his wife, along with several letters from her friend, writer Mary E. Buckley to her friend, Horace Swope. The Charlotte Rumbold Speeches Series includes her speeches on street life and housing conditions. The Caroline Rumbold Travel Diaries Series includes three diaries from her trip around the world in 1928 and 1929. Caroline Rumbold's travel diaries and her letters to siblings from her world tour are similar in content. The Miscellaneous Series includes Caroline Rumbold's scrapbook and Charlotte Rumbold's "Report of the Housing Committee of The Civic League of St. Louis."