A. W. Helman Jr books & textbook
Pomona Winter 1995 Vol. XXVI, No. 1
Sheridan Bell A. W. Helman Jr Frank Kirby W. L. Rohrer Peter C. Scott Alexander Pal David Kuchta Gary Schultheis Peter T. Atkinson Garfield Shults Joe Hecksel et al Lon Rombough
North American Fruit Explorers NAFEX /1995T Journal / 81 Pages
