TY  - GEN
AU  - Cooper,W.E.
AU  - Holub,Robert F.
TI  - International intercalibration and intercomparison program radon daughter measurements: exercise at the Twilight Mine, Uravan, CO 
T2  - Information circular
PY  - 1990///
CY  - Washington, D.C.
PB  - U.S. Dept. of the Interior, Bureau of Mines
KW  - Mine gases
KW  - Colorado
KW  - Twilight Mine
KW  - Measurement
KW  - Radon
KW  - Isotopes
ER  -