Archived OPP Reference Material
- OPP The Silent Scourge (Joan E Mueller, The Shepherd magazine, 1986)
- OPP and Finnsheep (Brian Magee, The Shepherd magazine, 1987)
- OPP General Fact Sheet (Drs Randall Cutlip and Cindy Wolf, The Shepherd magazine, 1991)
- Comparative Evaluation, AGID and ELISA Tests (Dr Andres de la Concha-Bermejillo, USAHA, 1995)
- AGID or ELISA? Testing for OPP (Judy Lewman, The Shepherd magazine, 1996)
- Ovine Progressive Pneumonia Update (ASI Sheep Production Handbook, Cutlip et al, 1997)
- OPP Society has Role in Industry Conference (The Wisconsin Shepherd, 1999)
- Health Certification Program: Impossible Dream? (Jean T Walsh, The Shepherd, 2002)
- OPP Research, Texas Ag Experiment Station, 10 Years (Dr Andres de la Concha-Bermejillo, 2002)
