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Someone posted a link below to this map on the David Rumsey map collection (http://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~248974~5516374:Isochronic-
by danielbarla 11y ago
Someone posted a link below to this map on the David Rumsey map collection (http://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~248974~5516374:Isochronic-Distance-Chart,-1904--Av http://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~24...). You can get a high-res version there, or order a print directly.