The collection includes correspondence, photographs, genealogical data, diaries, programs, clippings, legal and financial papers, and memorabilia of Nelson P. Darling and his son Frank Nelson Darling. There are letters from Billie Burke, Anton Long, Gustav C. Luders, Leopold Stokowski, and Florenz Ziegfield.

The collection includes correspondence, 1910-1939, League of Nations material, Prentiss Bailey Gilbert's writings, biographical and family data and University of Rochester Extension School material. Also, certificates, diplomas and documents received by Prentiss Bailey Gilbert.