https://openlibrary.org/books/OL21573014M.opds 2019-01-08T04:35:13Z Arthur Eisenkraft https://openlibrary.org/authors/OL3244230A/Arthur_Eisenkraft It's About Time Armonk, N.Y 1998 163 p. : Subtitle on cover and spine: Sports. Includes index. "Active Physics has been developed in association with the American Association of Physics Teachers (AAPT) and the American Institute of Physics (AIP)." CR eng https://openlibrary.org/books/OL21573014M https://archive.org/details/activephysics00eise urn:ISBN:1891629042