Via BoingBoing: "Visualizing the course of the Mississippi over millenia" as depicted by a 1944 U.S. Army Corps of Engineers geological survey.
I would love to see a similar map of the Snake River.
hat tip PF Billingsley
Via BoingBoing: "Visualizing the course of the Mississippi over millenia" as depicted by a 1944 U.S. Army Corps of Engineers geological survey.
I would love to see a similar map of the Snake River.
hat tip PF Billingsley