@book{72359,
	author = {Unesco and Conference on Principles and Methods of Integrating Aerial Survey Studies of Natural Resources for Potential Development},
	title = {Aerial surveys and integrated studies=exploration aerienne et etudes integrees :},
	publisher = {Unesco,},
	year = {c1968.},
	series = {Natural resources research. Recherches sur les ressources naturelles, 6},
	address = {Paris :}
}