Encyclopedia of Global Warming Research the latest information on global warming with this link to the 3 volume set by Salem Press. Students may investigage the phenomena of climate change and greenhouse gases and their effects on many species and environments.
Ohio History Central Encyclopedia Ohio History Central is an evolving, dynamic online encyclopedia that includes subject experts and edited to form a consistent, readable, and straightforward reference. Etnries include subject-specific bibliographies and, where appropriate, photographs and textual cross-references to related essays.
Reference U.S.A. Directory information for 11 million U.S. businesses, 1 million Canadian businesses, 120 million U.S. households, 11 million Canadian residents, and 683,000 U.S. health care providers. Search for business by SIC codes, sales volume and number of employees.
World Book Online Resources include encyclopedic content, e-books, mulitmedia, a vast collection of primary source documents, and a wealth of research tools that allow students to customize and save their work.