OAK Search

Use this search portal to locate quality online publications, reports, and books from a number of open access collections, including those listed below.

BioMed Central
arXiv
DataCite
Directory of Open Access Journals
HathiTrust
Project Gutenberg
Public Library of Science (PLoS)
Research Papers in Economics (RePEc)
Institutional Repositories at Harvard, Iowa State, University of California system, and many others.