Here's one I'd be willing to bet on !

by Mork, Friday, September 08, 2017, 22:01 (347 days ago) @ Gringo Viejo

Oscar Sherman Adams - 1919 - ‎Conical projection (Cartography)
Any equal-area projection possesses this property, but it is not conversely true that any projection possessing this property is also an equal- area projection.

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