CAUSES, NATURE AND RATE OF SOIL DEGRADATION IN THE NORTHERNMOST STATES OF NIGERIA AND AN ASSESSMENT OF THE ROLE OF FERTILIZER IN COUNTERACTING THE PROCESSES OF DEGRADATING.

WORLD BANK. ENVIRONMENT Department. POLICY PLANNING AND RESEARCH STAFF.

出版	WORLD BANK. ENVIRONMENT Department. POLICY PLANNING AND RESEARCH STAFF, 1989
URL	http://books.google.com.hk/books?id=IXQzzwEACAAJ&hl=&source=gbs_api