Weertz, Jan/Weertz, Els/Duffin, Christopher: Therapeutic stone powder from ecclesiastical sources: supplementary comments. In: Pharmaceutical Historian 2020 (50, 2), pp. 59–64.

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Weertz, Jan/Weertz, Els/Duffin, Christopher: Therapeutic stone powder from ecclesiastical sources: supplementary comments. In: Pharmaceutical Historian 2020 (50, 2), pp. 59–64.