The Othmer Library of Chemical History collects, preserves, and helps make obtainable supplies associated with the history of science, know-how, and medication, with the emphasis on chemistry and chemical engineering from historic to present day periods. The Othmer Library now residences around one hundred sixty,000 print and microform volumes, http://places-of-interest16936.pages10.com/The-Science-History-Institute-of-Philadelphia-Diaries-40640911