Coverage: varies. A collection of scientific or technical documents circulated electronically to facilitate peer exchange and scientific advancement. Included are pre-publication drafts of journal articles (preprints), scholarly papers, technical communications, or similar documents.
Spans over 150 years. Contains over 3 million documents, plus patents and government data. A federated vertical search portal for 15 leading science and technology societies. Covers physics, engineering, mathematics, geosciences, and computing science.