@book{26929,
	author = {Waterschoot van der Gracht, W. A. J. M. van},
	title = {The Permo-Carboniferous orogeny in the south-central United States /},
	publisher = {Noord-Hollandsche Uitg. Mij.,},
	year = {1931.},
	series = {Verhandelingen der Koninklijke Akademie van Wetenschappen te Amsterdam, Afdeeling Natuurkunde. Tweede sectie ;},
	address = {Amsterdam :},
	note = {Part of illustrative matter folded in pocket.}
}