Kircher, Athanasius.  "Systema ideale quo exprimitur, aquarum per canales hydragogos subterraneos ex mari et in montium hydrophylacia protrusio, aquarumq[ue] subterrestrium per pyragogos canales concoctus."  Map.  1668.  Norman B. Leventhal Map Center,  https://collections.leventhalmap.org/search/commonwealth:n8710p88b (accessed May 25, 2018).