CONSERVATION and productivity of natural waters.

Ижил төстэй зүйлс

• Conservation and productivity of natural waters The Proceedings of a symp. organized jointly by the Brit Ecolog. Soc. and the Zoolog. Soc. of London, held at the Zoolog. Soc. of London on 22 and 23 Oct., 1970
  Хэвлэсэн: (1972)
• Our natural resources and their conservation
  -н: Parkins, Almon Ernest
  Хэвлэсэн: (1948)
• A Catalogue of films on nature conservation.
  Хэвлэсэн: (1967)
• Methods for assessment of fish production in fresh waters
  -н: Ricker, William Edwin
  Хэвлэсэн: (1968)
• METHODS for assessment of fish production in fresh waters