@book{2520,
	author = {Heijdeman, W. J. and Mierlo, Th. C. W. van,},
	title = {De rekenliniaal,},
	publisher = {N. v. Uitgevers-mij. "Kosmos"},
	year = {[1944]},
	address = {Amsterdam,},
	edition = {7 druk.,}
}