TY  - BOOK
AU  - Watkins,Joel S.
AU  - Godson,Richard H.
AU  - Watson,Kenneth
ED  - United States
TI  - Seismic detection of near-surface cavities
U1  - 523.3 
PY  - 1967///.
CY  - Washington: 
PB  - United States Government Printing Office, 
KW  - Seismic prospecting
KW  - Moon
KW  - Surface
N1  - Prepared on behalf of the National Aeronautics and Space Administration; Includes bibliographical references (p. A12)
ER  -