Graybill, H. W. (1921). THE INCIDENCE OF BLACKHEAD AND OCCURRENCE OF HETERAKIS PAPILLOSA IN A FLOCK OF ARTIFICIALLY REARED TURKEYS. The Rockefeller University Press.

Graybill, H. W. THE INCIDENCE OF BLACKHEAD AND OCCURRENCE OF HETERAKIS PAPILLOSA IN A FLOCK OF ARTIFICIALLY REARED TURKEYS. The Rockefeller University Press, 1921.

Graybill, H. W. THE INCIDENCE OF BLACKHEAD AND OCCURRENCE OF HETERAKIS PAPILLOSA IN A FLOCK OF ARTIFICIALLY REARED TURKEYS. The Rockefeller University Press, 1921.