1. Biological specialization in phytophthora infestans

   • Donald Reddick
   • Willard Crosier

   OriginalPaper Pages: 129 - 134

2. Fostering the certified seed potato deal more effectively

   • E. M. Gillig

   OriginalPaper Pages: 134 - 138

3. Early potato marketing along the atlantic seaboard

   • A. E. Mercker

   OriginalPaper Pages: 138 - 139

4. Potato spraying in ohio

   • Paul E. Tilford

   OriginalPaper Pages: 140 - 141

5. Sectional notes

   • Frank Hussey
   • Wn. H. Martin
   • E. V. Hardenburg

   OriginalPaper Pages: 142 - 146

6. New developments in fertilizers

   OriginalPaper Pages: 148 - 148