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Hydrologic unit map-1974, State of Pennsylvania.
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Hydrologic unit map-1974, State of Pennsylvania.

Scale 1:500,000; 1 in. equals approx. 8 miles. Relief shown by spot heights. "Lambert conformal conic projection standard parallels 33⁰ and 45⁰." "Base map drainage modified in 1974." Base map "Compiled in 1953. Edition of 1955." Includes text and table of hydrologic units. AACR2

Date
1974
Mapmaker / publisher
Geological Survey (U.S.); Water Resources Council (U.S.)
Place
Pennsylvania
Scale
1:500,000
Archive
Library of Congress (via Wikimedia Commons)
Type
map
Original size
14,488 × 8,086 pixels

Public domainsafest

Reason: a US government work.

Read from: Commons licence category: PD US Government; no CC BY, CC BY-SA, GFDL or deletion tag on the file page.

Credit line

"Hydrologic unit map-1974, State of Pennsylvania." (1974). Geological Survey (U.S.); Water Resources Council (U.S.). Library of Congress, Geography and Map Division, via Wikimedia Commons. Public domain. https://commons.wikimedia.org/wiki/File:Hydrologic_unit_map-1974,_State_of_Pennsylvania._LOC_76695072.jpg

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