@book{55042,
	author = {Sepúlveda Bojórquez, Maximino.},
	title = {Estudio de los suelos del área experimental (INIF) "La Pila", San luis Potosí, S.L.P.},
	publisher = {El autor,},
	year = {1978},
	address = {Chapingo, Méx. :}
}