TY  - RPRT
TI  - Survey of trace elements in coals and coal-related materials by neutron activation analysis
AU  - R.R. Ruch
AU  - R.A. Cahill
AU  - J.K. Frost
AU  - L.R. Camp
AU  - H.J. Gluskoter
PY  - 1977
DO  - 10.1007/bf02520217
UR  - https://pubs.usgs.gov/publication/70000748
ID  - 70000748
ER  -