There is a letter book / account book of 347 p., 1790-1856, containing 466 draft copies of his commercial and social correspondence with shipping agents in Great Britain, France, Spain, Portugal, Holland, Germany, China, Canada, as well as in the United States. The correspondence concerns Bell's business arrangements, the various cargos he shipped and their disposal, political affairs affecting the shipping trade, laws and treaties of various countries to be dealt with, taxes, embargoes, piracy, threats of war, and other pertinent events. A second account book of 84 p. (many are blank), 1787-1852, for the Ship Stephania and others contains ships' records for 1799 to 1828 and miscellaneous accounts up to 1857. There is a one volume carbon typescript (113 p.) of genealogical notes and reminiscences by Gordon Knox Bell (Regent of the University of the State of New York and grandson of Isaac Bell) and others, ca.1940. There is also an essay and lists of the residents of Greenwich Street (including the Bell and Rogers families) by Elizur Yale Smith with related correspondence, 1940.

The collection includes seven volumes of scrapbooks containing clippings on current affairs roughly between 1939 and 1950 with particular reference to the trials of the German War Criminals at Nuremberg and the state of Germany after World War II. Also, general items on President Franklin Roosevelt and U.S. foreign policy. There are several complete copies of newspapers folded and inserted in the scrapbooks. The second and more important part of the collection consists of typescripts of Dr. Pfeiffenberger's writings. These occupy one and one-half manuscript boxes (Boxes 4 and 5). Included are about 45 pages of poetry in German, about 120 pages of selected stories of New York Life (in German), about 30 pages on The European State-System, 1848-1890 (in German), 127 pages of manuscript entitled "The Spirit of the Code of Hammurabi" (this is a preliminary draft in English of a short book or article by Pfeiffenberger), about 305 pages of typescript on "Compensation in the Western Zone of Germany" by Pfeiffenberger, Dr. H. Klein, and Dr. Klavehn-Berndt (there are many changes and notes in script, and this item is accompanied by another typescript of approximately the same size on the same subject), and several other items.