Russell, R. Scott The soil root system in relation to braziliam agriculture ; proceedings of the symposium... - Londrina : Fundacao Instituto Agronómico do Paraná, 1981 - 372 p. : ilus. ; gráfs. LCCN: 53945 Subjects--Topical Terms: RaícesSuelos y cultivos. Dewey Class. No.: 633.4 / R8