The herd book of the National Pig Breeders' Association.
National Pig Breeders' Association.
London : National Pig Breeders' Association,
The book is made up of the Middle White, Tamworth, Berkshire, Large White and Wessex Saddleback sections from 1929, the Large Black from 1950, the Gloucestershire Old Spots and Welsh from 1952, the Landrace from 1955.
Description based on: 1929.