Field-audit site operator training [electronic resource] / by Gregory A. Wetherbee, Shannon M. Green and Jihn A. Gehrke ; U.S. department of the interior ; U.S. geological survey. - vers. 1.0. - 2006. - 1 compact disc (CD-ROM) ; 12cm. - (Open-file report ; 2006-1010). - Sustem requirements: IBM-compatible computers running windows 98 SE. - [MFN: 2246]