TY  - RPRT
TI  - Challenge infection as a means of determining the rate of disease resistant Trichomonas gallinae-free birds in a population
AU  - R. M. Kocan
AU  - J.O. Knisley
PY  - 1970
DO  - 10.7589/0090-3558-6.1.13
UR  - https://pubs.usgs.gov/publication/5220522
ID  - 5220522
ER  -