GEHRELS, A.M.J. - Ruimtevaart-onderzoekingen naar het ontstaan van het zonnestelsel.

1981. Nw. Verh. Bataafsch Gen. proefonderv. Wijsbeg. Rotterdam (3) 2-9; 14 pp. 4 fig./phot. Orig. wrps. with libr. stamp, very good, 4to.

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