During the closures due to COVID-19, the Buffalo History Museum held many different webinars. One of those webinars was: The Holland Land Company and the Development of Western New York by Ryan Duffy.
Ryan Duffy is the Executive Director for the Holland Land Office Museum in Batavia, New York: http://hollandlandoffice.com.
Some of the Holland Land Company records were microfilmed and digitized by the SUNY Fredonia Library to be added to the collections housed on the New York Heritage website. You can read more about the Holland Land Company digitized collection here: https://nyheritage.org/collections/holland-land-company-archives.
One of the books that exist on many Western New York library shelves is the “Pioneer History of the Holland Purchase of Western New York” by O. Turner. This book has been digitized and is available on Archive.org and can be found here: https://archive.org/details/pioneerhistoryof00turn.