My understanding is that map projections are essentially complex mathematical formulae, and as such cannot be copyrighted. Would date of release/development work? This list is not complete, but includes many: https://en.wikipedia.org/wiki/List_of_map_projections

Nat

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can anyone tell me the best way to find a list of copyright dates for world map projections developed in the 20th century.

Thanks

George Carhart

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---------------------------

Dr. George S. Carhart, Ph.D

Historian of Cartography

and Early Modern Europe

Antiquarian Map Consultant

Historic Research Consultant

7 Lafayette Street

Portland

ME, 04101

USA

(207) 766-1517