00931cam a22002771  4500001001300000003000400013005001700017008004100034010001700075035002000092040004700112042001200159050003000171100005000201245004800251260002300299300002300322410004800345505008500393650002500478650003900503650002400542740002200566740004800588999001700636gs 62000242 DLC20260227111411.0860128m19629999dcua          000 0 eng c  ags 62000242   a(OCoLC)13071316  aU.S. Geol. Survey. Libr.cTxHRdOCoLCdDLC  apremarc00aQE75b.C5 no. 460 A, etc.1 aLeopold, Luna B.q(Luna Bergere),d1915-2006.10aConservation networks,cby Luna B. Leopold.  aWashington,c1962-  av.billus.c27 cm.20aGeological Survey (U.S.).tCircularv460 A-0 apt.A. The man and the hill.--pt.B. A national network of hydrologic bench marks. 0aHydrologyxResearch. 0aNaturexEffect of human beings on. 0aWater conservation.0 aMan and the hill.0 aNational network of hydrologic bench marks.  c29640d29640