TY  - RPRT
TI  - Report on the operations of the coal-testing plant of the United States Geological Survey at the Louisiana Purchase Exposition, Saint Louis, Missouri, 1904: Part I.--Field work, classification of coals, chemical work
AU  - E.W. Parker
AU  - J.A. Holmes
AU  - M. R. Campbell
PY  - 1906
DO  - 10.3133/pp48
UR  - https://pubs.usgs.gov/publication/pp48
ID  - pp48
ER  -