In its first telephone book recycling program, the school system of Citrus County recently collected 13 tons. The national average for a first-time telephone book recycling program is 10 percent; Citrus County produced 24.79 percent. "Citrus County was one of our most successful recycling efforts," said Larry Bush, community relations administrator for United Telephone Co. of Florida. "It proves that the people are concerned about their environment and are willing to work to make a difference." The effort involved not only the school system but also Citrus County officials, United Telephone and Waste Management of Central Florida Inc. The phone books will be taken to Jacksonville, where they will be turned into backing paper for gypsum wallboard.