@book{55129,
	author = {Sepúlveda Silva, Sergio.},
	title = {The effects of modern technology on labor for producing crops on small in two integrated rural development districts in Colombia},
	publisher = {New York State College of Agriculture and Life Sciences,},
	year = {1979},
	series = {Cornell International Agriculture. Mimeograph},
	address = {Ithaca, N.Y. :}
}