Key to the families of North American insects.

Geahča maid

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