na INLIS000000000026321 Ind 0010-1218008159 Seed potato systems in the Philippines: a case study CRISSMAN, Charles Charles C. Crissman Los BAnos Philippine Council for Agric., Forestry and Natural Resources Research and Development 1989 68 p. : illl. ; 28 cm. 68 p. : illl. ; 28 cm. ISBN 92-9060-136-1 635.21-153CRIs 635.21-153 SEED POTATOES PHILIPPINES 0160/90-mfn28177