00351nam a2200097   450000100070000000500170000700800360002410000220006024501530008226400180023500183720260807101253.0260101s1947    pe      000 0 eng  d1 aM. Acosta-Solís10aSoil erosion in the agricultural highlands of Ecuador and suggestions for its protection by appropriate plants, principally by Setaria Cernua H.B.K. 1aChicagoc1947