Whenever I go into a second-hand store like Goodwill or Value Village, I check out the book section to see if there are any books that mention Niagara Falls. There is a place called Renewed Thrift & Vintage in Welland, Ontario that I was in recently. There were several older books that I thought I would post about.
This book is called Canada A Symphony in Color (ISBN 0862834287). The book is over 30 years old, as you can tell by the photos. There were several photos of Niagara Falls, but not really any specific information about the falls.