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Location and stratigraphy of known occurrences of fossil tetrapods in the Upper Pennsylvanian and Permian of Pennsylvania, West Virginia, and Ohio
Vol 33, Page 1
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Late Pennsylvanian and Early Permian vertebrates of the Pittsburgh-West-Virginia region
Vol 33, Page 47
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An archeological survey of the proposed Shenango River reservoir area in Ohio and Pennsylvania
Vol 33, Page 113
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Status of the South American Iguanid lizard, Enyalius coerulescens Cope
Vol 33, Page 125
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Variation of the shapes of birds’ eggs within the clutch
Vol 33, Page 129
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New Indo-Australian Agaristid moths
Vol 33, Page 141
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Occurrence of the eastern tiger salamander, Ambystoma tigrinum tigrinum (Green) in Maryland, with notes on its life history
Vol 33, Page 145
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Notes on some birds of the Adirondack and Catskill Mountains, New York
Vol 33, Page 149
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Hypsoparia bozemanensis; a new genus and species of leptarctine mustelid from the late Miocene Madison Valley formation of Montana
Vol 33, Page 179
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Remarks on evolution and color pattern in the Gossci group of the frog genus Eleutherodactylus
Vol 33, Page 185
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Geographic designation of the members of the Chadron formation in South Dakota
Vol 33, Page 197
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A new wasp of the genus Habritys (Pteromalidae: Hymenoptera) from Wisconsin and New York
Vol 33, Page 199
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Skull variation in the meadow vole (Microtus p. penn-sylvanicus) in Pennsylvania
Vol 33, Page 201
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Observations on mammals along the east coast of Hudson Bay and the interior of Ungava
Vol 33, Page 235
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The ground snake, Haldea valeriae, in Pennsylvania and West Virginia with description of new subspecies
Vol 33, Page 251
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Revised classification of the butterfly family Lycaenidae and its allies
Vol 33, Page 261
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Localities of the herpetological collections made during the "Novara Reise."
Vol 33, Page 275
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Systematic notes on North American birds. I. The herons and ibises (Ciconiiformes)
Vol 33, Page 287
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Plants from Lower Seal Lake, Ungava, Canada
Vol 33, Page 295
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Orchids of western Pennsylvania
Vol 33, Page 299
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Additional scolecodonts from the Potter Farm formation of the Devonian of Michigan
Vol 33, Page 347
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The new race of black Hawk of the species Buteogallus anthracinus from the Republic of Honduras
Vol 33, Page 387
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Notes on the fresh-water snail Leptoxis (Mudalia) carinata (Bruguière)
Vol 33, Page 391