@book{75667,
	author = {Grassi, Ernesto. and Muñoz Alonso, Adolfo.},
	title = {Las ciencias de la naturaleza y del espíritu / },
	editor = {Bachs)},
	publisher = {Luis Miracle, },
	year = {1952 (},
	address = {Barcelona : },
	edition = {1ª ed.}
}