00309nam a2200097Ia 450000500170000000800410001705000170005824500540007526000650012965000170019420251229172911.0251229s9999    xx            000 0 und d  aGB 1001 .G76 0aGround- water levels in the United States 1961-65  aWashingtonb D. C.c United States Goverment Printing Office  aGround Water