Über die Rauch- und Russfrage insbesondere vom gesundheitlichen Standpunkte und eine Methode des Russnachweises in der Luft / von H. Liefmann.

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Über die Rauch- und Russfrage insbesondere vom gesundheitlichen Standpunkte und eine Methode des Russnachweises in der Luft / von H. Liefmann. In copyright. Source: Wellcome Collection.

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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.