@book{33342,
	author = {National Research Council (U.S.). and ebrary, Inc.},
	title = {Modern masonry},
	publisher = {National Academy of Sciences,},
	year = {[1956]},
	series = {Publication (National Research Council (U.S.)) ;},
	address = {Washington :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10071503}
}