The SAO/NASA Astrophysics Data System (ADS) is operated by the Smithsonian Astrophysical Observatory (SAO) under a NASA grant. The ADS maintains three bibliographic databases containing more than 10.0 million records: Astronomy and Astrophysics, Physics, and arXiv e-prints. The main body of data in the ADS consists of bibliographic records, which are searchable through highly customizable query forms, and full-text scans of much of the astronomical literature which can be browsed or searched via our full-text search interface.
TRID is the world's largest and most comprehensive bibliographic resource on transportation research information. It is produced and maintained by the Transportation Research Board of the US National Academies. TRID covers all modes and disciplines of transportation and contains more than 1.1 million records of published research. TRID is an integrated database that combines the records from TRB’s TRIS Database and the OECD’s ITRD Database.
TRID covers all modes and disciplines of transportation: Aviation, highway, marine, motor carriers, pedestrians and bicyclists, pipelines, public transportation and railroads. TRID includes Research in Progress project records.
The Thermophysical Properties of Matter Database (TPMD), contains thermophysical properties of over 5,000 materials with approximately 50,000 data curves.
