Hello Brian:
I've done a few podcasts on the history of cartography lately. Here are two, then a third from the British Library Map Room:
New Books Network interview for New Books in American Studies, Carrie Lane, December 20 2019. https://newbooksnetwork.com/susan-schulten-a-history-of-american-in-100-...
Utah Public Radio. http://www.upr.org/post/history-america-100-maps-susan-schulten-mondays-...
The British Library also has a map podcast.
https://www.bl.uk/magnificentmaps/events1.html
Angie Cope
AGS Library, UW Milwaukee
Libraries
2311 E. Hartford
Avenue
Milwaukee, Wisconsin 53211
43°03'8"N 87°57'21"W
