From the U. S. National Agricultural Library. Indexes about 5000 journals. Links to some full-text articles. Subjects covered include food and human nutrition, environmental science, and agriculture. Coverage is from 1970 to the present.
From Los Alamos National Lab and Cornell University. Searchable. Includes physics, mathematics and computer science, and quantitative biology preprint literature. Full text is available is various formats. Covers 1991 to the present. Open access.
Indexing for over 2200 journals in agriculture, ecosystem ecology, energy, natural resources, geography, pollution and environmental law. Provides full-text for over 900 journals. Coverage is from 1888 to the present.
Addresses human impacts on the environment. Offers indexing and abstracts for about 300,000 records. Some full-text. Coverage is from about 1915 to the present. Can be used for course content: Extensive full-text content.