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Londonderry Geological Map Portlock 1843
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Londonderry Geological Map Portlock 1843

Geological map from Report on the Geology of the County of Londonderry, and of Parts of Tyrone and Fermanagh

Date
December 31, 1843
Mapmaker / publisher
J.E. Portlock (1794-1864)
Archive
Wikimedia Commons
Type
map
Original size
17,526 × 21,079 pixels

Public domainsafest

Reason: its maker died more than 70 years ago.

Read from: Commons licence category: PD-old-70-expired; no CC BY, CC BY-SA, GFDL or deletion tag on the file page.

Credit line

"Londonderry Geological Map Portlock 1843" (December 31, 1843). J.E. Portlock (1794-1864), via Wikimedia Commons. Public domain. https://commons.wikimedia.org/wiki/File:Londonderry_Geological_Map_Portlock_1843.jpg

What public domain means here

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