كتب ذات صلة

The toxic property of sulphur

Progress in the control of elm diseases in nurseries

A method of destroying or preventing the growth of Algæ and certain pathogenic bacteria in water supplies.

Insects and insecticides.

• Insects and insecticides.
  
• The pear thrips (Euthrips pyri)
  المؤلفون: Moulton, Dudley.