كتب ذات صلة

Technical drug studies by the Division of Drugs. Examination of hydrogen dioxid solutions.

Die wachsbereitenden Organe bei den gesellig lebenden Bienen

• British bee-keeper''s practical note-book followed by a description of the W.B.C. hive and how to make it, a home-made hive from used boxes, how to build a bee house, and short rules for the management of moveable comb-hives.
  المؤلفون: Cowan, T. W.
• British bee-keeper''s guide book to the management of bees in movable-comb hives, and the use of modern bee-appliances. Illustrated.
  المؤلفون: Cowan, T. W.