A method of estimating accurately and quickly the correct x-ray dosage as measured by the pastilles of Drs. Sabouraud and Noiré / issued by W. Watson & Sons, Ltd.

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A method of estimating accurately and quickly the correct x-ray dosage as measured by the pastilles of Drs. Sabouraud and Noiré / issued by W. Watson & Sons, Ltd. Public Domain Mark. Source: Wellcome Collection.