由Office of Scientific and Technical Information (OSTI)开发的WorldWideScience.ORG——The Global Science Gateway

WorldWideScience.org is the prototype for a global science gateway connecting you to national and international scientific databases. WorldWideScience.org accelerates scientific discovery and progress by providing one-stop searching of global science sources.

Tags: science, Search Engine

今天的Resource Shelf上列举了几个常用的免费科学搜索工具，即学术搜索引擎，虽然大部分都用过，还是放在这里吧：

Scirus

Microsoft Live Search Academic

The Scitopia portal

The Global Science Gateway

CiteSeer

OAISTER

Science.gov

PubMedCentral

National Science Digitial Library

Biomed Central

Directory of Open Access Journals

Tags: science, Search Engine