I was recently alerted to the posting on L-C19 Americanists with news of a website (Atelier Ideas & Research) that curates an on-going list of digital map collections: https://www.air4edu.com/. There have been three episodes dropped so far to create a census of digital collections of maps / globes / atlasses, with a few more archives across the world: https://www.air4edu.com/academic-life/maps-globes-and-plans-an-ongoing-census-of-free-digital-archives-3/
This site was new to me and is of course useful to all scholars but in particular serves as a call to curators to add their own institutions with digitized collections.
Mary Pedley
Clements Library
The University of Michigan
forwarded by
Angie Cope
AGS Library, UW Milwaukee
Libraries
2311 E. Hartford
Avenue
Milwaukee, Wisconsin 53211
43°03'8"N 87°57'21"W