There are published and unpublished writings by Adler on mathematics, the philosophy of science, dialectical materialism, and on educational issues. There is correspondence related the publication and reception of these writings (notably Freeman Dyson), and a thick file of correspondence with AIMS Director Herbert Aptheker. Freedom of Information Act (FOIA) documents and correspondence comprise one folder each re: Adler's CIA and FBI files. Two City College files contain Adler's student writings and activist ephemera. Several files related to Adler's teaching career contain typescripts on the teaching of mathematics, Teachers Union ephemera and publications, and testimony and other documents from the administrative proceedings leading to his firing. Another file documents the similar case of Joyce Sparer, later Adler's second wife. Several files containing clippings and letters to newspaper editors on topical matters document Adler's activism following his move to Vermont. There are also files on the Spanish Civil War-related scholarships Adler established, files on several on miscellaneous events or topics, and a thick biographical file which contains an oral history transcript.