"This third edition describes collections received through December 31, 1978, and includes 1,640 collections of private papers; 186 collections of private papers, diaries, and account books on microfilm; and 480 account books. Additions to collections received through June 30, 1979 have been included."--Page vi.

A thorough inventory of research resources in American repositories, the Guide lists collections in the history of chemistry and chemical engineering, the chemical and pharmaceutical industries, and a number of related chemical process industries and businesses, from personal and professional papers of chemical scientists and engineers to business records of the chemical process industries.