TY  - RPRT
TI  - Inventario mundial de la calidad del carbon mineral (WoCQI) [The world coal quality inventory (WoCQI)]
AU  - R. B. Finkelman
AU  - V.S. Lovern
PY  - 2001
DO  - 10.3133/fs05801
UR  - https://pubs.usgs.gov/publication/fs05801
ID  - fs05801
ER  -