publicdomainreview:

Stunning set of maps depicting the changing course of the Mississippi River over millennia, created by US Army engineer Harold Fisk in 1944: https://publicdomainreview.org/collection/maps-of-the-lower-mississippi-harold-fisk

Prints also available here: https://publicdomainreview.org/collection/maps-of-the-lower-mississippi-harold-fisk

(via alterac)