General Reference

Online resource for preschoolers and early elementary grade students. 

Contains an extensive multimedia collection, including editor-selected websites, and correlations to state standards.

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 tree identification guide.

Ohio snake identification guide.

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

Exclusive full text for many top consumer small business reference books, as well as tools to address many small business topics.

Science encyclopedias and reference books.