Original caption:  "Figure 56.  Steel tipple, showing box car loader.  Shaft No. 10, Consolidation Coal Company, Buxton."  See <a href="https://en.wikipedia.org/wiki/Consolidation_Coal_Company_(Iowa)" class="extiw" title="en:Consolidation Coal Company (Iowa)">en: Consolidation Coal Company (Iowa)</a>.
Henry Hinds (1883-1964)
The Coal Deposits of Iowa, <a rel="nofollow" class="external text" href="https://books.google.com/books?id=1BUMAAAAYAAJ&amp;pg=PA236">Iowa Geological Survey Annual Report, 1908</a>, Des Moines, 1909; page 236.