The Othmer Library of Chemical History collects, preserves, and helps make available elements relating to the history of science, engineering, and drugs, with an emphasis on chemistry and chemical engineering from historical to modern occasions. The Othmer Library presently residences approximately 160,000 print and microform volumes, scarce publications and http://the-jewish-museum-of-mary67912.bloggin-ads.com/28011997/top-science-history-institute-of-philadelphia-secrets