00838cam a22002411 4500 gs 60000184 DLC 20260227111409.0 821007s1960 dcu f000 0 eng c gs 60000184 (OCoLC)8839658 U.S. Geol. Survey. Libr. MsSM DLC premarc QE75 .C5 no. 414 TD355 .L4 Leopold, Luna B. (Luna Bergere), 1915-2006. Conservation and water management. Washington, 1960. 4 v. (26 p.) 27cm. Geological Survey (U.S.). Circular 414 Contents.-pt. A. Conservation and protection.-pt.B The challenge of water management.-pt. C. The conservation attitude.-pt. D. Ecological systems and the water resource. Water conservation. 29439 29439