The coal-tar colors : with special reference to their injurious qualities and the restriction of their use; a sanitary and medico-legal investigation / ... Tr. with permission of the author by Henry Leffmann.

Public Domain Mark

You can use this work for any purpose without restriction under copyright law. Read more about this licence.

Credit

The coal-tar colors : with special reference to their injurious qualities and the restriction of their use; a sanitary and medico-legal investigation / ... Tr. with permission of the author by Henry Leffmann. Public Domain Mark. Source: Wellcome Collection.