LDGSL/1107/A/1/2 | Institute of Geophysics and Planetary Physics, University of California, 1967 | 1965 | 
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LDGSL/1107/A/1/6 | Cambridge University, Jan-Mar 1969 | Jan-Mar 1969 | 
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LDGSL/1107/A/1/7 | California Institute of Technology (Caltech), 1969 | Apr-Jun 1969 | 
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LDGSL/1107/A/1/8 | Institute of Geophysics and Planetary Physics, University of California, 1969 | Jul-Aug 1969 | 
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LDGSL/1107/A/1/10 | General scientific correspondence, 1970 | 1970 | |
LDGSL/1107/A/1/11 | General scientific correspondence, 1971 | Jan-Jul 1971 | |