Common Poultry Diseases – Small and backyard poultry (extension.org)
Parasite Management for Natural and Organic Poultry: Blackhead in Turkeys | ATTRA | Sustainable Agriculture Project (ncat.org)- Factsheet discussing Blackhead disease, also called Histomoniasis, is a serious disease capable of decimating turkey flocks and negatively affecting other poultry.
Parasite Management for Natural and Organic Poultry: Coccidiosis | ATTRA | Sustainable Agriculture Project (ncat.org)- This publication provides information on its life cycle, transmission in free-range production, management in the brooder and on pasture, natural treatments, drugs, and vaccines.
Poultry: Merck Veterinary Manual