More than 700 areas in Ohio, useful as sites for environmental and outdoor studies, are catalogued in this guide. They include national forests; state parks; forest and wildlife areas; historic sites and memorials; metropolitan, country, and city parks; agency and private camps; conservation agency properties; conservancy district lands and reservoirs; school land laboratories; private conservation farms and campgrounds; and nature preserves. For a general overview of the state, four maps in the introduction show physiographic sections, geology, glacial deposits, and original natural vegetation. The major section of the guide compiles the areas in alphabetical order by counties. Each entry provides a short description of the bio-physical features of the area or site together with its official name, location, size, and source to contact for additional information. A separate chapter is devoted to nature preserves, "living museum" type areas, often outstanding remnants of woodlands, swamps, prairies, glacial relic vegatation, and/or geologic phenomena. A concluding index identifies each area by type (natural environment, school camping, conservation education, or undeveloped) and specified their facilities for public use. Notes on how to use the guide are included. (BL)