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A biometrical study of egg production in the domestic fowl. 3, Variation and correlation in the physical characters of the egg / by Raymond Pearl, Ph.D., biologist, Maine Agricultural Experiment Station and Frank M. Surface, Ph.D., biologist, Maine Agricultural Experiment Station.

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A biometrical study of egg production in the domestic fowl. 3, Variation and correlation in the physical characters of the egg / by Raymond Pearl, Ph.D., biologist, Maine Agricultural Experiment Station and Frank M. Surface, Ph.D., biologist, Maine Agricultural Experiment Station.

Diseases of poultry : their etiology, diagnosis, treatment, and prevention / by Raymond Pearl, Frank M. Surface and Maynie R. Curtis.

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A biometrical study of egg production in the domestic fowl. 3, Variation and correlation in the physical characters of the egg / by Raymond Pearl, Ph.D., biologist, Maine Agricultural Experiment Station and Frank M. Surface, Ph.D., biologist, Maine Agricultural Experiment Station.

Diseases of poultry : their etiology, diagnosis, treatment, and prevention / by Raymond Pearl, Frank M. Surface and Maynie R. Curtis.