Is there a difference between a wilderness in a national park and a wilderness in a national forest? Why are cows and sheep allowed to graze in wilderness? Are airports permitted? The Wilderness Act Handbook, reissued by The Wilderness Society, aims to answer these and other questions about this country's 96 million acre National Wilderness Preservation System. The handbook contains the eloquent 1964 Wilderness Act itself, a section-by-section interpretation of what it accomplishes and what Congress intended, and a list of wilderness preservation milestones. First published in 1984, the 68-page guide also describes differences in federal agencies' management of wilderness. The handbook reviews the debate that shaped the act's evolution but gives short shrift to modern controversies such as limiting recreational uses. The release of the $5 second edition coincides with the 30th anniversary of the Wilderness Act. For a copy, write to The Wilderness Society, Attn: Publications, 900 17th St., N.W., Washington, D.C. 20006-2596. (202/833-2300).