Science in Context provides abstracts or the full text of scholarly journal articles as well as reference and multimedia material.

Nature links to a weekly science journal.

Science links to a weekly journal of scientific research.

BioOne online journals provide access to inter-related journals that focus on biological, ecological and environmental sciences.

First Search has databases that can be searched for citations to journals and books.

CSA Illumina Cambridge Scientific Abstracts provides access to 35 scientific databases.

High Wire Press has 11 scientific journals with full text available online. In addition, High Wire Press has free links to many other full-text journals. Search by category.

Today's Science draws on major scientific journals, magazines and newspapers in the United States and abroad to present the latest scientific discoveries and the fundamental concepts that underlie them.

Annual Reviews provides systematic, periodic examinations of scholarly advances in science and social science through critical authoritative reviews. Search by broad subjects (called "suites") or by more narrow series, including microbiology, public health, psychology and sociology.

Reference Works
Biology
A Dictionary of Biology
A Dictionary of Earth Sciences
A Dictionary of Ecology
A Dictionary of Plant Sciences
A Dictionary of Scientists
Encyclopedia Britannica
Environmental Issues: Essential Primary Sources
Environmental Science In Context
The Oxford Companion to the Earth
The Oxford Companion to the History of Modern Science