@misc{indiciaeb024938e6168,
  title = {Hierarchical systems analysis in karst terrains; Part A, Approaches and applications to environmental characterization; Part B, Analysis of environmental impacts of aggregate mining},
  author = {K.E. Kolm and W. H. Langer},
  year = {2000},
  doi = {10.3133/ofr00429},
  url = {https://pubs.usgs.gov/publication/ofr00429},
  note = {Source identifier: ofr00429}
}