https://openlibrary.org/books/OL5819582M.opds 2020-09-28T06:07:44Z Aristotle https://openlibrary.org/authors/OL6856645A/Aristotle University of Nebraska Press [Lincoln] 1961 xiii, 241 p. Includes indexes. eng https://openlibrary.org/books/OL5819582M https://archive.org/details/physics00aris 4689888 61005498