Reports of explorations and surveys, to ascertain the most practicable and economical route for a railroad from the Mississippi River to the Pacific Ocean: Vol. 2, Pt. 4

EXPLORATIONS AND SURVEYS FOR A RAILROAD ROUTE FROM THE MISSISSIPPI RIVER TO THE PACIFIC OCEAN.
WAR DEPARTMENT.
RE0PORT
ON THE
BOTANY OF THE EXPEDITION:
BY
JOHN TORREY AND ASA GRAY.
ROUTE NEAR THE THIRTY-SECOND PARALLEL OF NORTH LATITUDE, UNDER THE COMMAND OF BRET
CAPTAIN JOHN POPE, CORPS OF TOPOGRAPHICAL ENGINEERS.
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