@misc{indiciaea69596c281dd,
  title = {Sectional map of the state of Illinois : especially exhibiting the exact boundaries of counties as established by law and the general topography of the state as towns, streams, lakes, ponds, bluffs, rail-roads, state-\& common-roads \& tc. also the main coal field, mineral districts, outcrops of coalbanks, mines \& tc},
  author = {richter, leopold},
  year = {1861},
  url = {https://www.loc.gov/item/98688466/},
  note = {Source identifier: 98688466}
}