TY  - RPRT
TI  - Coal-mine accidents, their causes and prevention (a preliminary statistical report)
AU  - Clarence A. Hall
AU  - Walter Otheman Snelling
AU  - J.A. Holmes
PY  - 1907
DO  - 10.3133/b333
UR  - https://pubs.usgs.gov/publication/b333
ID  - b333
ER  -