Don't Kill the Laying Hen. A Book Describing and Explaining the Potter System of Selecting Laying and Non-Laying Hens, Also Recording and Illustrating His Investigations and Discoveries Concerning the Diseases of the Egg-Producing Organs

Don't Kill the Laying Hen. A Book Describing and Explaining the Potter System of Selecting Laying and Non-Laying Hens, Also Recording and Illustrating His Investigations and Discoveries Concerning the Diseases of the Egg-Producing Organs