1916. Geological Survey (U.S.). Relief shown by contours, spot heights and bathymetric isolines.; Title in lower right corner: Portland and vicinity; at head of map: Topography.; ... The Survey (Washington, D.C).
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1858. J.H. Bufford's Sons Lith. Relief shown by hachures. Bar scale in rods. Streets, wharves, and piers labeled. 31 x 43 centimeters Scale approximately 1:10,000 City Maps. J.H. Bufford's (Boston).