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Administration Letters, 1787-1940 (Series 168) 

Agents and Principals Register, 1894-1905 (Series 128)

Airport

       Agreements -- Acquisition & Contract, 1942-1978 (Series 276)

       Scrapbooks, 1944-1984 (bulk 1950-1966) (Series 248)

       Construction Files, 1937-1946 (Series 84)

       Subject Files, Commissioner of Public Works, 1944-1977 (Series 270)

Almshouse Records, 1854-1917 (Series 179) 

Appointment Records (County Elections), 1907-1922, 1935-1981 (Series 152) 

Appointment Records (Municipal Elections), 1898-1978 (gaps) (Series 153) 

Appointments to Office (Govenor's) , 1795, 1800-1840 (Series 112)

Architects Register, 1919-1951 (Series 4) 

Assumed Business Names Index, 1900-1933 (Series 46)

Atlases

       1867 Atlas of Westchester County

       1881 Atlas of Westchester County

       1901 Atlas of Westchester County

       1930 Atlas of Westchester County

       Sanborn Maps and Atlases Collection, 1887-1939 (gaps) (Series 316)

       Westchester County Atlases Collection, 1867-1984 (gaps) (Series 315)