By Kidwell Peggy Aldrich   in American Mathematical Monthly

ISSN:1930-0972|118|5|471-474

Mathematical Association of America‎(2011)‎

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By Kidwell Peggy Aldrich   in Imago Mundi: The International Journal for the History of Cartography

ISSN:0308-5694|61|1|91-96

Routledge Ltd‎(2009)‎

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