National Geographic Virtual Library provides full-text searching of National Geographic (1888-Present) and National Geographic Traveler (2010-Present). This comprehensive archive is an essential tool for researchers of all ages for the study of science, nature, geography and much more. [Gale]
Science Online presents a broad range of scientific disciplines through extensive definitions, essays, diagrams, biographies, and experiments. [Infobase]
Science Reference Center is a comprehensive research database that provides easy access to a multitude of full-text, science-oriented content. Designed to meet every student researcher's needs, Science Reference Center contains full text for hundreds of science encyclopedias, reference books, periodicals and other sources. [Ebsco]