If you're a conservationist - budding, seasoned amateur or salaried professional - you may want to check out Earth Work, published 11 times a year by the Student Conservation Association. Every other issue is labeled JobScan and contains nationwide environmental job listings ranging from seasonal internships to career opportunities. Other issues contain interviews with conservation professionals, excerpts from unpublished wilderness journals, articles on career trends and tips on job hunting. The Student Conservation Association has worked since 1957 to pair students who want to work in natural resource conservation with shorthanded agencies. Subscriptions cost $26.95 a year. Contact Earth Work, P.O. Box 550, Charlestown, NH 03603-0550 (603/543-1700).