Expedition earthscope /
Earthscope tells the dramatic story of the North American continent and how a ten-year project is surveying the American landscape to get clues about its origin.
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[Oley, Pennsylvania] :
[Distributed by] Bullfrog Films,
by: Hussey, Russell C. b. 1888.
by: Richards, Horace Gardiner, 1906-
by: King, Philip Burke, 1903-
by: Murray, Grover E. 1916-2003.
by: Schuchert, Charles, 1858-1942.