Abstract
Abstract The third edition of Dr. Johannsen's famous work represents a thorough revision of the earlier editions, incorporating the multifarious findings of recent research; additions have also been made to the wealth of fascinating and instructive illustrations. It is evident that the author has made full use of the very comprehensive and sometimes not easily accessible literature on his subject. It is to be regretted that he did not find it possible to complete his book with a bibliography since this would have provided an indispensable tool for all future research in this vast and important segment of the history of human civilization. The book is provided, however, with a detailed index which makes it easy to refer to particular questions, and we are told that the source material is assembled in the Biicherei des Vereins deutscher Eisenhiitienleute in Dusseldorf where it is accessible to those interested.
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