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Hathi Trust Digital Library
Nearly 4 million titles and over 6 million volumes digitized by major research libraries. Many of the titles are the ones digitized by the Google Books project but the collection also includes many non-Google titles. Intended for use by academic researchers.
Search the full text of millions of books digitized by Google from major academic libraries. Most pre-1923 texts are available in full and can usually be downloaded as pdf files.
A project of the Internet Archive which contains nearly 2 million full-text ebooks. A smaller collection than Google Books or Hathi Trust but it sometimes has volumes unavailable elsewhere.
Library of Congress Classification
Materials in Preus Library are organized via the Library of Congress Classification System. You can explore how to find works you're looking for by browsing the organization found at the link below.
For example, you can find books related to Science in the Q section, things specific to Chemistry would be found in the QD subclass. Works related to Technology are classified under "T" and specifically those works related Chemical Technology can be found in the call number range TP1-1185. Information about Explosives and Pyrotechnics can be found at TP267.5-301.
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