General Reference

Information resources for pre-school through college.

Thousands of colorful illustrations, diagrams, and maps enrich thousands of articles selected for appeal and curricular standards, with teacher guides, provide instructions and stimulating ways to use content in the classroom setting or for homework.

Identify flint artifacts from Ohio's prehistoric peoples.

Ohio snake identification guide.

Very Short Introductions provide intelligent and serious introductions to a huge range of subjects. 

Science encyclopedias and reference books

An essential tool for researchers and students of theology and philosophical studies. 

Essays on controversial subjects.

Long-form overview articles written, peer-reviewed, and edited by leading scholars.