TY  - RPRT
TI  - The determination of 28 elements in whole coal by direct-current arc spectrography
AU  - J.D. Fletcher
AU  - D. W. Golightly
PY  - 1985
DO  - 10.3133/ofr85204
UR  - https://pubs.usgs.gov/publication/ofr85204
ID  - ofr85204
ER  -