@book{3817,
	author = {Ahn, Peter M. and Irvine, Frederick Robert.},
	title = {West African agriculture.},
	publisher = {Oxford U.P.,},
	year = {c1970.},
	address = {London,},
	edition = {3d ed.},
	note = {First-2d eds., by F. R. Irvine, have title: A text-book of West African agriculture, soils and crops.}
}