Haeckel's theory of the unity of nature : a monograph in the history of philosophy /Author: DeGrood, David H.,
Publisher: Amsterdam : B. R. Gruner Pub. Co.,
Date: 1982. This title can be found in 2 Iowa libraries.
Haeckel's theory of the unity of nature; a monograph in the history of philosophy,Author: DeGrood, David H.,
Publisher: Boston, Christopher Pub. House
Date: [1965] This title can be found in 2 Iowa libraries.
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