On the Principles of Nature
- HTML (Single page, 38KB) at TheologyWebsite.com (Translated by Prof. Gerard Campbell)
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- Paperback edition of Aquinas on Matter and Form and The Elements : A Translation and Interpretation of the De Principiis Naturae and the De Mixtione Elementorum, translated by Joseph Bobick (Univ of Notre Dame Pr, 1998).
All links verified on or after October 31, 2019