كتب ذات صلة

The various contrivances by which orchids are fertilised by insects

The selection of tobacco seed plants

Pollination of deciduous fruits by bees

Observations on the colors of flowers

• Weed control
  المؤلفون: Ball, Walter S.
• The shot hole borer
  المؤلفون: Smith, Leslie Malcolm
• Selective weed killers
  المؤلفون: Crafts, Alden Springer ,  Harvey, W. A.