Longwall and room-and-pillar productivity : a review of the U.S. coal mines /
| Data(s) |
28/12/1994
|
|---|---|
| Resumo |
Includes bibliographical references. Mode of access: Internet. |
| Formato |
bib |
| Identificador | |
| Idioma(s) |
eng |
| Publicador |
Washington, DC : U.S. Dept. of the Interior, Bureau of Mines, |
| Direitos |
Items in this record are available as Public Domain, Google-digitized. View access and use profile at http://www.hathitrust.org/access_use#pd-google. Please see individual items for rights and use statements. |
| Palavras-Chave | #Coal mines and mining #Longwall mining #Pillaring (Mining) |
| Tipo |
text |
