The middle Triassic marine invertebrate faunas of North America,
by James Perrin Smith.
- Washington, Govt. Print. Off., 1914.
- 254 p. XCIX pl. on 500, fold. tab. 30 cm.
- U. S. Geological Survey. Professional paper 83 .
Issued also as House Doc. 587, 63d Cong., 2d sess. Plates printed on both sides of leaves. Includes index.