ISBN-13: 9780367286057 / Angielski / Twarda / 2019 / 256 str.
ISBN-13: 9780367286057 / Angielski / Twarda / 2019 / 256 str.
Published in 1979. This book the first IADS sponsored volume on a commodity written especially for authorities, nonagricultural as well as agricultural, in developing countries and for the assistance agencies which cooperate with them.