TY - RPRT TI - Laboratory analysis and airborne detection of materials stimulated to luminesce by the sun AU - W. R. Hemphill AU - A.F. Theisen AU - R.M. Tyson PY - 1984 DO - 10.1016/0022-2313(84)90108-x UR - https://pubs.usgs.gov/publication/70013516 ID - 70013516 ER -