Notes on Microscopic Crystals included in some minerals, etc. (Extracted from the Proceedings of the Academy of Natural Sciences of Philadelphia.)‪.‬

The GENERAL HISTORICAL collection includes books from the British Library digitised by Microsoft. This varied collection includes material that gives readers a 19th century view of the world. Topics include health, education, economics, agriculture, environment, technology, culture, politics, labour and industry, mining, penal policy, and social order.