TY - BOOK AU - Harold E. Thomas TI - Conservation of ground water : A Survey of the present ground-water situation in the United States U1 - 551.49 PY - 1951/// CY - New York PB - Mcgraw Hill Book Co Inc N1 - Harold E. Thomas: Conservation of ground water : A Survey of the present ground-water situation in the United States. New York. Mcgraw Hill Book Co Inc, 1951.--(551.49THO) ER -