There's also the Getty Open Content Program:

- https://www.getty.edu/about/whatwedo/opencontent.html

- https://search.getty.edu/gateway/search?cat=highlight&dir=s&...

Here is a great collection of maps you might want to add.

https://www.davidrumsey.com/

License there is CC BY-NC-SA 3.0

Thank you sooooo much. This is such great work, the wife and I were just discussing the need for something like this mere days ago.

You are a true scholar.