LDGSL/1107/A/1/11
General scientific correspondence, 1971
Jan-Jul 1971
LDGSL/1107/A/1/19
General correspondence, 1979
Jan-Jun 1979
LDGSL/1107/A/1/24
General correspondence, 1984
1984
LDGSL/1107/A/1/28
General correspondence, 1988
1988