The author discusses the meaning of grooves and hollows in stones and churchwalls. The scrapings were probably used as a medicine.

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Grondboor & Hamer

CC BY 3.0 NL ("Naamsvermelding")

Nederlandse Geologische Vereniging

Th. Ramskou. (1972). Steenschraapsel als medicijn. Grondboor & Hamer, 26(1), 21–24.