@misc{indiciaebd71eb6e265c,
  title = {Reconstructing late Cenozoic stream gradients from high-level chert gravels in central Eastern Kansas},
  author = {J.W. Harbaugh and D. F. Merriam and H.H. Howard},
  year = {2007},
  url = {https://pubs.usgs.gov/publication/70031279},
  note = {Source identifier: 70031279}
}