@misc{indiciaee3efa333b32a,
  title = {Utilization of humus-rich forest soil (mull) in geochemical exploration for gold},
  author = {Gary C. Curtin and H. W. Lakin and G. J. Neuerburg and A.E. Hubert},
  year = {1968},
  doi = {10.3133/cir562},
  url = {https://pubs.usgs.gov/publication/cir562},
  note = {Source identifier: cir562}
}