Book Signing When White House staff planning their bosses' visits to Iowa State saw ISU's Farm House Museum, they immediately thought "photo op." But they needed evidence of the 135-year-old campus landmark's legacy and charm to show to President Bill Clinton, Vice President Al Gore and Secretary of Agriculture Dan Glickman, who were planning an April 25 visit to campus. They found it in Farm House: College Farm to University Museum, a new book by Mary E. Atherly, collections manager for University Museums and associate curator of the Farm House Museum. The Farm House has been a stagecoach stop and home to farm managers, deans and university presidents over the years. While a photo op didn't fit into the presidential schedule, the book made it back to Atherly -- autographed by both Clinton and Gore. The book is available from the Iowa State University Press, 2121 S. State Ave., Ames, IA 50010; call (515) 292-0155. _____ contact: University Relations, (515) 294-3129 updated: 9-28-95