International Astronomical Union. Highlights of astronomy. As presented at the XIIIth general assembly of the I.A.U. 1967. Edited by Lubo Perek.

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International Astronomical Union.

Highlights of astronomy. As presented at the XIIIth general assembly of the I.A.U. 1967. Edited by Lubo Perek.

Astronomy -- Congresses.

Astronomy fast (OCoLC)fst00819673

Conference proceedings. fast (OCoLC)fst01423772

Perek, Lubo , ed.