The fonds consists of textual records, photographs (prints and Negatives), pictorial images, postcards, statistical information, and maps. All of the records reflect Moses B. Cotsworth's involvement in calendar reform and his efforts to make his 13-month calendar more widely known throughout the world. Administrative records of his International Fixed Calendar League as well as papers reflecting his interests in mathematics, astronomy and astrology are included. The records have been arranged into the following series: Correspondence and Personal Notes; Newspaper Articles; Pamphlets on Calendar Reform and Related Material; Posters and Related Material; Records Relating to Egypt (Pyramids, Sphinx); Records Relating to Stonehenge; Statistical Charts and Graphs; and Records Relating to Miscellaneous Subjects.