Provides citations to journal articles, government reports, and books in agriculture and related disciplines.

Contains full text articles from bioscience research journals focused on biology and environmental science.

Maintains a daily publication on climate policy.

Maintains citations and abstracts for engineering and the applied sciences.

Provides full text journals, books, and reference works that cover agriculture, ecosystem ecology, energy, renewable energy sources, natural resources, marine and freshwater science, geography, pollution and waste management, environmental technology, environmental law, public policy, social impacts along with urban planning.

Provides citations and abstracts of articles in environmental, ecology, and water resources journals, conference proceedings, EPA reports, and books.

Contains citations and abstracts to international literature of geography, geology, ecology, and international development.

Contains full text articles and books as welll as trade publications covering all aspects of sustainability and corporate social responsibility. 

Contains the full text of McGraw Hill's Encyclopedia of Science and Technology as well as science news and videos.

Provides detailed scientific information for species of birds nesting in the U.S. and Canada.

Aggregates and indexes chemical structures and their associated information into an open access repository. Offers text and structure searches for compounds.

Collects ebooks that synthesize important research or developments in the life sciences.

Academic peer-reviewed books.

Freely available electronic journals

The Encyclopedia of Earth (EoE) is a collaborative, open, peer-reviewed reference resource about the Earth, its natural environments, and the relationship between the environment and society.

Offers citations and abstracts about the earth sciences including palaeontology.

Maintains a global reference on the environment, energy, and natural resources.

Includes full text, technical publications from the U.S. Government. 

Contains information on grey literature produced in Europe. Covers science, technology, biomedical science, economics, social science and the humanities.

Portland State University's Digital Repository, PDXScholar, preserves the University's research, unique resources, and other scholarly output with the goal to provide persistent, open access to that work.

Features selected, authoritative science information provided by U.S. Government agencies including research and development results.

Offers free, publicly-available,Department of Energy (DOE) sponsored R&D results including technical reports, bibliographic citations, journal articles, conference papers, books, multimedia, and data information.