Books by R. R. Murphy:
Books in the extended shelves:
![[X-Info]](https://onlinebooks.library.upenn.edu/infouc.gif)
Murphy, R. R. (Robert Russell), 1901-1974: Effect of light and availability of feed on egg production (Pennsylvania State College, School of Agriculture, Agricultural Experiment Station, 1943), also by E. W. Callenbach and John E. Nicholas (page images at HathiTrust)- Murphy, R. R. (Robert Russell), 1901-1974: Electric brooding under winter conditions (Pennsylvania State College, School of Agriculture, Agricultural Experiment Station, 1941), also by E. W. Callenbach and John E. Nicholas (page images at HathiTrust)
- Murphy, R. R. (Robert Russell), 1901-1974: Feeding systems for laying hens (Pennsylvania State College, School of Agriculture, Agricultural Experiment Station, 1942), also by E. W. Callenbach (page images at HathiTrust)
- Murphy, R. R. (Robert Russell), 1901-1974: Influence of light on age at sexual maturity and ovulation rate of pullets (Pennsylvania State College, School of Agriculture, Agricultural Experiment Station, 1944), also by E. W. Callenbach and John E. Nicholas (page images at HathiTrust)
- Murphy, R. R. (Robert Russell), 1901-1974: Light intensity as a factor in the artificial illumination of pullets (Pennsylvania State College, School of Agriculture, Agricultural Experiment Station, 1944), also by John E. Nicholas and E. W. Callenbach (page images at HathiTrust)
- Murphy, R. R. (Robert Russell), 1901-1974: The vitamin D requirements of growing chicks and laying hens (Pennsylvania State College, School of Agriculture and Experiment Station, 1934), also by Jesse Elmo Hunter and H. C. Knandel (page images at HathiTrust)
- Murphy, R. R. (Robert Russell), 1901-1974: The vitamin D requirements of growing chicks and laying hens (Pennsylvania State College, School of Agriculture and Experiment Station, 1936), also by Jesse Elmo Hunter and H. C. Knandel (page images at HathiTrust)
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