UNITED States,Dept.of Commerce
Appropriate technology information for developing countries / - 3rd ed. - United States NTIS 1981 - xxx, 453 p.
69357
600.0822 / UNI
Appropriate technology information for developing countries / - 3rd ed. - United States NTIS 1981 - xxx, 453 p.
69357
600.0822 / UNI