*Astronomy: Getting Started

ArXiv is an e-print service in the fields of physics, mathematics, non-linear science, computer science, quantitative biology, and statistics.

A comprehensive resource for research and communications in the geosciences, built on a core database aggregation of peer-reviewed journals indexed, linked, and inter-operable with GeoRef.

A NASA-funded project which maintains four bibliographic databases containing more than 4.0 million records: Astronomy and Astrophysics, Instrumentation, Physics and Geophysics, and preprints in Astronomy. The main body of data in the ADS consists of bibliographic records and abstracts of articles and monographs which are searchable and full-text scans of much of the astronomical literature which can be browsed.

Web of science indexes and abstracts citations in research journals across the disciplinary spectrum. Online version of: Arts and humanities citation index (1975-present); Science citation index (1900-present); and Social sciences citation index (1956-present).