LDGSL/1107/A/1/1
California Institute of Technology (Caltech), 1967
Dec 1966-Jul 1967
LDGSL/1107/A/1/2
Institute of Geophysics and Planetary Physics, University of California, 1967
1965
LDGSL/1107/A/1/3
Lamont Geological Observatory, 1967-1968
Dec 1967-Feb 1968
LDGSL/1107/A/1/14
General correspondence, 1974
1973-1974