Online Books by
Homer Munro Derr
Books from the extended shelves:
![[X-Info]](https://onlinebooks.library.upenn.edu/infouc.gif)
Derr, Homer Munro: A method of petrographic analysis, based upon chromatic interference with thin sections of doubly-refracting crystals in parallel polarized light ... ([Philadelphia] Randal Morgan Laboratory of Physics, 1903) (page images at HathiTrust)- Derr, Homer Munro: A method of petrographic analysis, based upon chromatic interference with thin sections of doubly-refracting crystals in parallel polarized light ... ([Philadelpia] Randal Morgan laboratory of physics, 1903) (page images at HathiTrust; US access only)
- Derr, Homer Munro: Plane trigonometry, (Boston, New York [etc.] Ginn and company, [c1923]), also by Bolling H. Crenshaw (page images at HathiTrust; US access only)
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