Title: ʻOlam ha-devarim ha-gedolim ṿeha-ḳeṭanim /
Authors: Hartel, Karl.; Leṿin, Mikhaʼel
Publisher: Sifriyat poʻalim : haḲibuts ha-artsi ha-Shomer ha-tsaʻir,
Year: 1954
Subjects: Inventions Popular works.; Technology Popular works