TY  - RPRT
TI  - Contributions to economic geology (short papers and preliminary reports), 1920 : Part II. - Mineral fuels
AU  - David White
AU  - G. H. Ashley
AU  - M. R. Campbell
PY  - 1917
DO  - 10.3133/b641
UR  - https://pubs.usgs.gov/publication/b641
ID  - b641
ER  -