Carnegie Mellon University Libraries have digitized The American Journal of Science from 1819 to 1895. Users can search the collection for words within articles, or browse by issue at http://ajs.library.cmu.edu/. The collection is free to read on the Internet and there are no copyright restrictions on the content. The American Journal of Science has been published since 1818, making it the oldest continuously-published U. S. scientific journal. Historically, the journal covered a broad spectrum of science, from biology to mathematics. Originally titled The American Journal of Science and Arts, early issues also included articles on music, architecture and metaphysics. Currently, The American Journal of Science focuses on geology and related natural sciences, and in 2003 was ranked first among peer-reviewed earth sciences journals publishing new content.