The Motion, evolution of orbits, and origin of comets; symposium no. 45, held in Leningrad, U.S.S.R., August 4-11, 1970. Edited by G.A. Chebotarev, E.I. Kazimirchak-Polonskaya and B.G. Marsden.

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The Motion, evolution of orbits, and origin of comets; symposium no. 45, held in Leningrad, U.S.S.R., August 4-11, 1970. Edited by G.A. Chebotarev, E.I. Kazimirchak-Polonskaya and B.G. Marsden.

Comets -- Congresses.

Chebotarev, G. A. (Gleb Aleksandrovich), ed.

Kazimirchak-Polonskaia, E. I., ed.

Marsden, Brian G. ed.

International Astronomical Union.