@misc{indiciaed49633aa042f,
  title = {Enzyme leaching of surficial geochemical samples for detecting hydromorphic trace-element anomalies associated with precious-metal mineralized bedrock buried beneath glacial overburden in northern Minnesota},
  author = {Robert J. Clark and A. L. Meier and G. Riddle},
  year = {1990},
  url = {https://pubs.usgs.gov/publication/70016136},
  note = {Source identifier: 70016136}
}