na INLIS000000000026320 Ind 0010-1218008158 Seed potato systems in Ecuador: a case study CRISSMAN, Charles C. Charles C. Crissman; Jorge E. Uguillas Lima CIP 1989 xi, 56 p. : ill. ; 28 cm. xi, 56 p. : ill. ; 28 cm. ISBN 92-9060-137-X 635.21-153CRIs 635.21-153 SEED POTATOES 0158/90-mfn28176