LDGSL/1107/A/1/11
General scientific correspondence, 1971
Jan-Jul 1971
LDGSL/1107/A/1/29
General correspondence, 1989
1989
LDGSL/1107/A/1/31
General correspondence, 1991
1991
LDGSL/1107/A/1/33
General correspondence, 1993
Jan-December 1993