National Research Council (U.S.). Highway Research Board. (1959). Soil and materials surveys by use of aerial photographs: Presented at the thirty-seventh annual meeting, January 6-10, 1958.

National Research Council (U.S.). Highway Research Board. Soil and Materials Surveys by Use of Aerial Photographs: Presented at the Thirty-seventh Annual Meeting, January 6-10, 1958. Washington, D.C, 1959.

National Research Council (U.S.). Highway Research Board. Soil and Materials Surveys by Use of Aerial Photographs: Presented at the Thirty-seventh Annual Meeting, January 6-10, 1958. 1959.