This is great. Thanks for creating and sharing it.
I made a similar list, definitely going to have to compare notes to see what I've missed!
https://www.kevan.tv/2020/12/14/the-best-sites-for-public-do...
https://www.kevan.tv/2020/12/14/the-best-sites-for-public-do...
I have David Rumsey on the list already. Historical map lovers may also like King George's collection of Military Maps, at the Royal Collection Trust: https://militarymaps.rct.uk/the-maps