Treasurer's record book, 1885-1911; accounts of the library, 1891-1915; check book stubs, 1899-1939 (with gaps); treasurer's reports, 1904-1934; annual reports, and membership applications, 1929-1931; annual reports to the New York State Education Department, 1911-1917; receipts, clippings, photographs, and insurance premiums, 1890-1916; deeds, certificate of incorporation, amendments to bylaws, mortgage papers, map of property, title search, and dedication program, 1916-1950; floor plans for the library by Milton C. Sherman, n.d.; account of library circulation, 1939-1941; five volumes of "Register of Borrowers Entitled to Borrow Books from the Library," 1937-1963; account book, 1964-1965; specification book for the Shelter Island Public Library, 1964; and correspondence, bills, and reports of income and expenses, 1938-1946.
