New York Public Library catalog
Avery Architectural Library, Columbia University – guides to the collection
Main catalog accessed through the Columbia University catalogue, CLIO
Avery architectural periodical index (accessible from the New York Public Library – 42nd Street – art and architecture room)
Withey: Biographical Dictionary of American Architects (Deceased)
Real Estate Record and Guide – on-line at Columbia
AIA Historical Directory of American Architects
American Architect and Building News online
Library of Congress: Chronicling America