1. Relation of vitamin D to keel bone deformity in young chickens;Johnson;Poultry Sci.,1944
2. Early roosting as a cause of crooked keels in Single Comb White Leghorn cockerels;Platt;Poultry Sci.,1932
3. Crooked keels in relation to width of perch;Platt;Poultry Sci.,1933
4. Physiologic and genetic studies of crooked keels in chickens;Warren;Kan. Agri. Exp. Sta. Tech. Bul.,1937