Sage Data (formerly Data-Planet) is an interactive database that allows users to create tables, maps, and figures from a variety data sources covering banking, criminal justice, education,energy, food and agriculture, government, health, housing and construction,industry and commerce, labor and employment, natural resources and environment, income, cost of living, stocks, transportation, and more.
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The Astrophysics Data System (ADS) is a NASA-funded project which maintains four bibliographic databases containing more than 3.6 million records: Astronomy and Astrophysics, Instrumentation, Physics and Geophysics, and preprints in Astronomy.
The Science Citation Index, a part of the Web of Science, is a multidisciplinary database of bibliographic information indexed so that you can search for specific articles by subject, author, journal, and/or author address.
This site features the Society of Industrial and Applied Mathematics' e-book collection.
This links to the society's e-journal portal, listing their fourteen journals. The date range for online volumes is from 1997 to present. The actual Home Page for the society is www.siam.org
Maintained by the Centre de Donnes astronomiques de Strasbourg (CDS), France, it provides basic data, cross-identifications, bibliography and measurements for astronomical objects outside the solar system.
The SPIE Digital Library contains the world's largest collection of optics and photonics applied research. With more than 445,000 papers spanning biomedicine, communications, sensors, defense and security, manufacturing, electronics, energy, and imaging, the SPIE Digital Library is the most extensive research database available on optics and photonics research.