Open air guides: Beetles. Translated and edited by C.M.F. Von Hayek.

United Kingdom: Thames and Hudson, 1956. Octavo, publisher's cloth, colour plates, line drawings. Lacks dustwrapper, sunned spine.
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United Kingdom: Thames and Hudson, 1956. Octavo, publisher's cloth, colour plates, line drawings. Lacks dustwrapper, sunned spine.
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