Hi Glenn -
The Library of Congress Geography and Map Division has digitized a number of Sanborn fire insurance maps of Holyoke, Massachusetts and they can be accessed here.
Further information about these maps should be sought from the Geography and Map Division.
All the best,
Library of Congress
Dear Mr. Shealey,
Thank you for posting your request on History Hub!
We searched the Library of Congress catalog and located 6 digital editions of the Sanborn Fire Insurance Maps for Holyoke, Hampden County, Massachusetts.
We hope this is helpful. Best of luck with your research!