Stephen Bishop
... that Stephen Bishop's 1842 map of Mammoth Cave, drawn from memory, was so accurate that it remained in use for more than forty years?
... that <b id="mwA4c"><a href="./Stephen_Bishop_(cave_explorer)" id="mwA4g" rel="mw:WikiLink" title="Stephen Bishop (cave explorer)">Stephen Bishop</a></b><span about="#mwt48" class="nowrap" data-mw='{"parts":[{"template":{"target":{"wt":"`s","href":"./Template:`s"},"params":{},"i":0}}]}' id="mwA4k" typeof="mw:Transclusion"><span typeof="mw:Entity">'</span>s</span> 1842 map of <a href="./Mammoth_Cave_National_Park" id="mwA4o" rel="mw:WikiLink" title="Mammoth Cave National Park">Mammoth Cave</a>, drawn from memory, was so accurate that it remained in use for more than forty years?