TY  - BOOK
AU  - Hart, B. A.
AU  - Thayer,G.D.
AU  - Dougherty,H.T.
ED  - United States.
ED  - United States.
TI  - Local and durnal variations in ground-based radioactivity gradients at tropical locations
U1  - 621.3 
PY  - 1971///
CY  - Washington, D.C.
PB  - U.S. Department of Commerce
KW  - Electric engineering
ER  -