Astronomy and astrophysics abstracts : Vol. 2, Literature 1969, pt. 2 / Edited by, S. Bohme, W. Fricke, U. Guntzel-Lingner, F. Henn, D. Krahn, G. Zech. Astronomisches Rechen-Institut, Heidelberg. International Astronomical Union. Astronomy Abstracts Periodicals. Astrophysics Abstracts Periodicals. Astronomy Bibliography Periodicals. Astrophysics Bibliography Periodicals. QB3 .A8 Z5153 .A862 520.0822 BOA Includes Index. Berlin : Springer-Verlag, c1969. c1969. 1969 Text Collection x, 516 p. : eng