@misc{indiciaee3d94ed79f78,
  title = {Structure contour maps on the base of Mississippian strata and the top of upper Cambrian strata, Springfield 1 degree by 2 degrees Quadrangle, Missouri},
  author = {C.M. Seeger},
  year = {1989},
  doi = {10.3133/mf1830g},
  url = {https://pubs.usgs.gov/publication/mf1830G},
  note = {Source identifier: mf1830G}
}