Locations other than SUNY ESF that hold Steele archives
The River Campus Library at the University of Rochester - New York - http://rbscp.lib.rochester.edu/4344
The Rochester Historical Society - new York - http://www.rochesterhistory.org/
The Trustees of Reservations Archives and Research Center - Archives specific to Naumkeag in Stockbridge, Massachusetts.
The Library of Congress - https://www.loc.gov/