ProQuest SIRS [non-fiction ebooks]

ProQuest SIRS

SIRS Discoverer is a general reference database for upper elementary and middle school learners, researchers, and educators covering curriculum areas content sets such as reading, language arts, current events, science, social studies, history, and health.

http://discoverer.prod.sirs.com/discoweb/disco/do/editorial?database=discoverer&page=nonfiction