English, Peter R.
The sow : improving her efficiency / Peter R. English, William J. Smith, Alastair MacLean. - 2nd ed. - Ipswich : Farming Press, 1982. - 354 p. : ill.
Sows.
The sow : improving her efficiency / Peter R. English, William J. Smith, Alastair MacLean. - 2nd ed. - Ipswich : Farming Press, 1982. - 354 p. : ill.
Sows.