AgEcon Search

Scholarly literature in agriculture and applied economics

ArticleFirst

Citations for many journals and magazines, 1990-present

arXiv.org

Open access database covering statistics and the sciences

Calisphere

Primary sources from the University of California Libraries

GPO MetaLib

Search more than 50 U.S. federal government databases

Medline

U.S. National Library of Medicine healthcare information

Portico

Repository for electronic resources

PubMed@UCR

More than 24 million citations for biomedical literature

TOXNET

Citations for resources on toxicology and related subjects

VectorBase

Resource center focused on invertebrate vectors of human pathogens