Original caption: "Figure 14.  Map giving location of principal mines in Boone county."  Mines have been tinted red by the uploader.  The towns shown are <a href="https://en.wikipedia.org/wiki/Boone,_Iowa" class="extiw" title="en:Boone, Iowa">Boone</a>, <a href="https://en.wikipedia.org/wiki/Ogden,_Iowa" class="extiw" title="en:Ogden, Iowa">Ogden</a>, <a href="https://en.wikipedia.org/wiki/Moingona,_Iowa" class="extiw" title="en:Moingona, Iowa">Moingona</a> and Coal Valley (now abandoned).  The railroads shown on the map are:  <a href="https://en.wikipedia.org/wiki/Chicago_and_Northwestern_Railway" class="extiw" title="en:Chicago and Northwestern Railway">en:Chicago and Northwestern Railway</a>, <a href="https://en.wikipedia.org/wiki/Minneapolis_and_St._Louis_Railway" class="extiw" title="en:Minneapolis and St. Louis Railway">en:Minneapolis and St. Louis Railway</a>, and <a href="https://en.wikipedia.org/wiki/Newton_and_Northwestern_Railroad" class="extiw" title="en:Newton and Northwestern Railroad">en:Newton and Northwestern Railroad</a>.
Henry Hinds
The Coal Deposits of Iowa, Chapter I of <a rel="nofollow" class="external text" href="https://books.google.com/books?id=1BUMAAAAYAAJ&amp;lpg=PA484&amp;pg=PA62">Iowa Geological Survey Annual Report, 1908</a>