Author: SONNLEITNER, A. TH.,
Title: De holenkinderen in het geheime dal.
Description: 's-Gravenhage, G.B. van Goor, 1st edition, 167pp. original half linen illustrated binding,many illustrations in the text by Fritz Jaeger and L.Hudribusch, Dutch adaptation by Casper de Jong. Scarce children's book.

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