LDGSL/1107/A/1/3 | Lamont Geological Observatory, 1967-1968 | Dec 1967-Feb 1968 | 
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LDGSL/1107/A/1/4 | Princeton University, 1968 | Mar-May 1968 | 
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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/1/10 | General scientific correspondence, 1970 | 1970 | |
LDGSL/1107/A/1/11 | General scientific correspondence, 1971 | Jan-Jul 1971 | |
LDGSL/1107/A/1/12 | General scientific correspondence, 1972 | 1972 | 
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LDGSL/1107/A/1/18 | General correspondence, 1978 | 1978 | |