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/1/6
Cambridge University, Jan-Mar 1969
Jan-Mar 1969
LDGSL/1107/A/1/13
General scientific correspondence, 1973
1973