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The limitations of science
Mysticism and logic and other essays
The new agriculture; or, The waters led captive
A notice of the origin, progress, and present condition of the Academy of Natural Sciences of Philadelphia
Hints towards the formation of a more comprehensive theory of life
Soldiers, cities, and landscapes : papers in honor of Charles L. Fisher
Man, past and present
Our heritage the sea
Autobiography of a farm boy
An examination of Weismannism