The Philippines Recommends for Conservation Farming in the Sloping Lands, vol. 1 Contour Farming /  Philippines Recommends Series No. 89. 

 - Los Baņos, Laguna, Philippines:   Philippine Council for Agriculture, Aquatic and Natural Resources Research and Development (PCAARRD), Department of Science and Technology (DOST)  2008 
 - xi, 269 pp,  ill.,  23 cm. 
<br/><br/><label>ISSN: </label>0115-7833