TY  - BOOK
AU  - Rock, Robert L.
CN  - TN295
CN  - TN295
CY  - Washington :
DA  - 1975.
ID  - 6856
KW  - Aerosols.
KW  - Radon
KW  - Coal mines and mining
PB  - U.S. Dept. of the Interior, Mining Enforcement and Safety Administration,
PP  - Washington :
PY  - 1975.
T1  - Evaluation of radioactive aerosols in United States underground coal mines /
TI  - Evaluation of radioactive aerosols in United States underground coal mines /
ER  -