The HathiTrust Digital Library is an excellent repository of information on books, many of which are digitized and readable on the website, while others, under copyright restrictions, cannot be read but can be searched for terms and names. The website is a result of a partnership between a number of institutions and organizations working together to preserve cultural information.
I found many easily accessed records of marriages and births for New York and for other States as well. There are also county histories and interesting records of jail censuses, agricultural reports, and political actions.
This is an excellent resource to check into when you are looking for that one more place to find your ancestors and their histories.
There is no charge to readers.
See HathiTrust to learn more and to begin the search there!