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OCR-text (abbyy)

Heertjes, Nicolaas
Petrological investigations of the coalmea-
sures sediments of South-Limburg (The Nether-
lands^.
4:o Maastricht 1942.
Diss. Groningen.
OCR-text (abbyy-crop)
__Heertjes , Nicolaas
Petrological investigations of the coalmea-
sures sediments of South-Limburg <The Nether-
lands).
4:0 Maastricht 1942.
Diss. Groningen.
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