„Flint, stone of all ages" is the title of an exposition, arranged by the Maastricht Museum of Natural History on occasion of the International Symposium on Flint on April 26-29, 1969. This exposition, intended for the interested layman, includes five chapters, e.o.: - Flint, what is it and where does it occur? - The origin of flint. - Flint-mining in pre-historic times. - The neolithic flint-mines of Ryckholt, province Limburg, Netherland. - Flint in historic time.

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Grondboor & Hamer

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Nederlandse Geologische Vereniging

D.G. Montagne. (1971). Vuursteen in alle tijden. Grondboor & Hamer, 25(3), 133–148.