L'ombre du passé

From Author Wars - https://authorwars.com/books/lombre-du-passe-1740402.html

Overview:

Title: L'ombre du passé
Author: Ivan Efremov
Year: 1958
Type: Short Fiction

Editions/Publications:

Unknown. Fiction, #53 (Unknown, Ivan Efremov, OPTA, F140, 148 pages, digest, MAGAZINE)
Unknown. Le brouillard du 26 octobre: et autres récits de la préhistoire (Unknown, Ivan Efremov, Gallimard Jeunesse, ISBN-10: 2070331725, 162 pages, Paperback, Anthology)