1993 HA
1993 HA2
1993 HA2
1993 HA2.
1993 HO1
1993 HO1
1993 I. A. P. P. P. - Jubilee Symposium
1993 IERS (International Earth Rotation Service) annual report.
1993 IERS (International Earth Rotation Service) annual report.
1993 January 8 (meeting)
1993 January 8 meeting of the Royal Astronomical Society
1993 KA
1993 KA
1993 KA2
1993 KA2
1993 KH
1993 KH
1993 KH
1993 Leonids in Kurdjali, Southern Bulgaria.
1993 March 12 (meeting)