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Topographic maps and sketch mapping (1920)
Finch, James Kip, 1883- · New York : John Wiley & Sons, Inc. · leaf 43
Fig. 11.—Relation of Drainage and Ridge Lines. … Hilltop Saddle Saddle?connecOng fwo hilisCartography · Military maps
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
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