A retired San Francisco real estate developer announced recently that he is donating a collection of about 150,000 historical maps to Stanford University.

David Rumsey had spent three decades collecting maps of the Americas, most of which were drawn between 1700 and 1925 but decided to donate them to the university, according to Stanford officials.

Rumsey, who is posting much of his collection online at http://www.davidrumsey.com, is also donating the digital copies of the maps.

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