Key to the families of North American insects.

Eitemau Tebyg

• An introduction to the classification of insects key to the families of north american insects
  gan: Brues, Charles T.
  Cyhoeddwyd: (1915)
• Tentative keys to the orders and families of Indian insects
  gan: Fletcher, T. Bainbrigge
  Cyhoeddwyd: (1926)
• Classification of insects: a key to the known families of insects and other terrestrial Arthopods
  gan: Brues, Charles T.
  Cyhoeddwyd: (1932)
• North American polypores
  gan: Gilbertson, R.L
  Cyhoeddwyd: (1986)
• Keys to the orders of insects.
  gan: Balfour-Browne, Frank
  Cyhoeddwyd: (2023)