The South Hadley History Room at the South Hadley Library is a valuable resource to do local history and to do genealogy.
They have book, maps, and internet resources.
Books
In Old South Hadley by Eastman
Geology of Old Hampshire County by Emerson
County Atlas of Hampshire (Massachusetts state book) – click to get PDF
The Power of Christian Benevolence by Hitchcock
Some Old Time Meeting Houses of the Connecticut Valley by Wight