1. Some comparisons of bacterial plant galls and of their causal agents

   • A. J. Riker
   • E. Spoerl
   • Alice E. Gutsche

   OriginalPaper Pages: 57 - 82

2. Root diseases of deciduous fruit trees

   • J. S. Cooley

   OriginalPaper Pages: 83 - 100

3. Preventing plant disease introduction

   • W. A. McCubbin

   OriginalPaper Pages: 101 - 139