Thatsachen zur Pocken- und Impffrage : eine statistisch-ätiologisch-kritische Studie / von H. Böing.
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Thatsachen zur Pocken- und Impffrage : eine statistisch-ätiologisch-kritische Studie / von H. Böing. Credit: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.. Public Domain Mark