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Scientific Content
![Cover of An index to the scientific contents of the Journal and Proceedings of the Academy of Natural Sciences of Philadelphia [1817-1910] Published in commemoration of the centenary of the academy, March 21, 1912](https://covers.openlibrary.org/b/id/9633091-L.jpg)
An index to the scientific contents of the Journal and Proceedings of the Academy of Natural Sciences of Philadelphia [1817-1910] Published in commemoration of the centenary of the academy, March 21, 1912
Scientific determination of the content of the elementary school course in reading ..
