This page is a subset of texts derived from the three major online Sourcebooks listed below. For more contextual information, for instance about the Islamic world, check out these web sites.
Internet Ancient History Sourcebook
Internet Medieval Sourcebook
Internet Modern History Sourcebook
Hundreds of important texts in the history of science are excerpted at this site and some links include full text versions. Virtually every subject in science is represented. Categories are broken down into historical eras and some geographical areas (i.e. China). Though many of the excerpts provide a brief insight into the work, some excerpts like Voltaire's letter on Newton are more comprehensive and therefore more useful. The lack of a search engine is made up for by the clean and useful navigation and anchor tags, leading from the index to more specific subjects. Paul Halsall's site is used by history professors as a handy primary text archive for undergraduate classes.