Brown, Lester Russell, 1934- Soil erosion : quiet crisis in the world economy / Lester R. Brown and Edward C. Wolf. - Washington, D.C. : Worldwatch Institute, c1984. - 49 p. - Worldwatch paper ; 60 . "September 1984." ISBN: 0916468607 (pbk.) : $4.00 Subjects--Topical Terms: Soil erosion.Soil conservation--Economic aspects.Soil conservation--Government policy. LC Class. No.: S623 / .B75 1984 Dewey Class. No.: 333.76/16�19