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Exploration
United States geological exploration of the
Fortieth Parallel.
Vol.1-4,7.	4:o Washington 1870-80.
(Professional papers of the Engineer De-
partment,U.S.Army.No.18.)
OCR-text (abbyy-crop)
2092 ( 7
__Exploration
United States geological exploration of the
Fortieth Parallel.
Vol.1-4,7.	4:0 Washington 1870-80.
(Professional papers of the Engineer De-
partment ,U.S.Army.No.18.)
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