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Essays on controversial subjects.

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

Historical maps of Ohio cities.

Science encyclopedias and reference books.

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

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

Ohio snake identification guide.

Ohio tree identification guide.

Identify flint artifacts from Ohio's prehistoric peoples.

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.