Images and Digital Collections:
Digital Commonwealth
Search "Holyoke". Images can be used for research purposes.

Massachusetts State Library Flickr collections:
Holyoke Queen of Industrial Cities Exhibit (2010)
The exhibit above, plus maps of Holyoke

Umass/Amherst Special Collections and University Archives Digital Collections

Explore History and Culture from the Smithsonian Collections

Library of Congress Prints and Photographs Division
Great resource for old historic images of all sorts – free to use for educational purposes

American Antiquarian Society - Worcester
Good resources for history teachers on this site.

Virtual Programs:

Webinars from the New England Historic Genealogical Society (Some programs are Free) 

The Contemporary Jewish Museum

Virginia Museum of History and Culture

Great resources for learning and teaching. Many topics are of national interest. 

Websites, online publications, research articles:
Historic Holyoke Massachusetts
Private blog with abridged editions of early histories of Holyoke and photographs.

Histories of the Holyoke Water Power Company and Holyoke Gas and Electric
Click on the images on the right of the screen for access to the texts.

Historical Journal of Massachusetts Online Archive 
Free access to journal articles from 1972-2018 on a wide variety of topics related to Massachusetts history. 

Historic Preservation Resources:
Massachusetts Historical Commission Database (Historic home inventory)
Historic New England (Preservation Resources)
Historic New England - Architectural Style Guide
Springfield PreservationTrust
Historic Buildings of Massachusetts
Private blog that includes 24 contemporary photographs of historic Holyoke buildings, with descriptions.

Local Organizations:
Wistariahurst Museum
Passport Holyoke

Exhibits, Directory of Holyoke Cultural and Arts Organizations:
Springfield Museum Library and Archives
Trustees of the Reservations

Resources for visitors to Holyoke:
Valley Visitor