TY  - RPRT
TI  - Determination of nitrogen in coal macerals using electron microprobe technique-experimental procedure
AU  - Maria Mastalerz
AU  - L.W. Gurba
PY  - 2001
DO  - 10.1016/s0166-5162(01)00024-6
UR  - https://pubs.usgs.gov/publication/70023283
ID  - 70023283
ER  -