Progress-report upon Geographical and geological explorations and surveys west of the one hundredth meridian, in 1872, under the direction of Brig. Gen. A.A. Humphreys, chief of engineers, United States army
Book digitized by Google and uploaded to the Internet Archive by user tpb. At head of title: Engineer department, United States army The regular annual report for 1872 was not pub. in separate form, but issued as appendix DD of the report of the chief of engineers of that year
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