Primary and secondary causes and consequences of contemporary forest decline Richard M. KleinTimothy D. Perkins OriginalPaper Pages: 1 - 43
The Niobrara River Valley, a postglacial migration corridor and refugium of forest plants and animals in the grasslands of central North America Robert B. KaulGail E. KantakSteven P. Churchill OriginalPaper Pages: 44 - 81
Variation among the Aureoid Senecios of North America: A geohistorical interpretation T. M. Barkley OriginalPaper Pages: 82 - 105