TRUMAN, C.C., BOSCH, D.D., FLETCHER, R.G. NON-DESTRUCTIVE SITE INVESTIGATION OF PREFERENTIAL PATHWAYS. TRANSACTIONS OF THE AMERICAN SOCIETY OF AGRICULTURAL ENGINEERS. PAPER #99-2144.1999. IN PROCEEDINGS OF THE ADVANCES IN WATER QUALITY MODELING. K. KING ED. INTERNATIONAL MEETING OF THE ASAE, TORONTO, CANADA. PP. 116-120. 1999.