@book{178878,
	author = { United Nations. Department of International Economic and Social Affairs.},
	title = {Natural resources of developing countries :},
	publisher = {United Nations,},
	year = {1970.},
	series = {series F. no. 21 },
	address = {New york :},
	note = {"National accounts statistics, series X, no. 18, speical issue."}
}