Translation of: 'Lebensstufen der Erde'. 2nd enlarged ed. Stuttgart : Freies Geistesleben, 1970.
Bibliography: p.152-154. _ Includes index.
The living earth : the organic origin of rocks and minerals by Walther Cloos. ISBN 0906155010. Published by Lanthorn Press in 1978. Publication and catalogue information, links to buy online and reader comments.