Valedictory address

Author: Worthington, Wilmer, 1804-1873.
Published 1835

A discourse on the advantages of the study of natural science : delivered by request of the Chester County Cabinet, introductory to their course of lectures, December 5th, 1835

Author: Dillingham, William Henry, 1790-1854.
Published 1835

Address to the Chester County Cabinet of Natural Science, at the organization of the society, on the 18th of March, 1826

Author: Darlington, William, 1782-1863.
Published 1826