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/1/12 | General scientific correspondence, 1972 | 1972 | 
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LDGSL/1107/A/1/13 | General scientific correspondence, 1973 | 1973 | 
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LDGSL/1107/A/1/14 | General correspondence, 1974 | 1973-1974 | 
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LDGSL/1107/A/1/15 | General correspondence, 1975 | 1975 | 
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LDGSL/1107/A/1/16 | General correspondence, 1976 | 1976 | |
LDGSL/1107/A/1/17 | General correspondence, 1977 | Jan-Mar 1977 | |
LDGSL/1107/A/1/18 | General correspondence, 1978 | 1978 | |