\12) Doan, F. J. 1956. Antibiotics in milk from farms. J. Dairy Sci. 39: 1766-1767. 
(13) Downing, H. E., Hardie, W. B., Hawley, G. E., and Price, K. E. 1954-1955. Tetra- 
cycline in veterinary medicine. Antibiotics Annual 312-317. 
(14) Drury, A. R. 1952. Evaluation of neomycin sulfate in treatment of bovine mastitis. 
Vet. Med. 47: 407-411. 
(15) Edwards, S. J., and Haskins, M. D. 1953. The determination of antibiotic levels in 
blood and in milk following parenteral and intramammary injections. J. Comp. 
Path. & Therap. 63: 53-67. 
(16) Foley, E. J., and Byrne, J. V. 1949. Observations onthe treatment of Streptococcus 
agalactiae and Staphylococcus aureus udder infections withmixture of streptomycin 
and penicillin. Cornell Vet. 39: 243-248. 
(17) Foley, E. J., Stults, A. W., Lee, S. W., and Byrne, J. V. 1949. Studies on vehicles 
for sustaining penicillin levels in the bovine mammary gland. Am. J. Vet. Res. 
10: 66-70. 
(18) Freedman, M. L., and Meara, P. J. 1959. Antibiotic contamination of milk supplies 
as a veterinary and public health program. South African Practitioner. 5. Nos. 1, 
2, 3 and 4. 
(19) Gildow, E. M., Fourt, D. L., and Shaw, A. O. 1938. Sulfanilamide in the treatment 
of streptococcic mastitis. J. Dairy Sci. 21:759-766. 
(20) Grove, D. C. 1959. Prevention of antibiotics in milk--present status. J. Dairy Sci. 
42: 199-201. 
(21) Guss, S. B. 1958. Survey of Pennsylvania veterinarians on mastitis and the anti- 
biotics problem. Vet. Med. 53: 50-52. 
(22) Hammond, P. B. 1953. Dihydrostreptomycin dose-serum level relationships in 
cattle. J.A.V.M.A. 122: 203-206. 
(23) Hansen, H. C., Wiggins, G. E., and Boyd, J. C. 1950. Modern methods of mastitis 
treatment cause trouble in the manufacture of fermented dairy products. Proc. 
31st annual meeting Western Div. Amer. Dairy Sci. Assoc. 67-74. 
(24) Hawley, G. E., Downing, H. E., Zolli, Z.,Sacchi, E. M., English, A. R., and Peterson, 
E. H. 1954-1955. Oxytetracycline in mastitis. Antibiotics Annual 329-335. 
(25) Henderson, B. W., Cobble, J. W., Easterbrooks, H. L. 1957. The recovery of milk 
and blood levels of Aureomycin when fed to lactating dairy cows. J. Dairy Sci. 
40: 617. 
(26) Hignett, S. L. 1950. Persistence of penicillin in the bovineudder. Vet. Rec. 62: 37- 
38. 
(27) Hollister, C. J., Huebner, R. A., Boucher, W. B., and DeMott, T. 1957. Parenteral 
benzathine penicillin V in cattle. Am. J. Vet. Res. 18: 584-586. 
(28) Hollister, C. J., Huebner, R. A., Boucher, W. B., and DeMott, T. 1959. Parenteral 
benzathine penicillin V in bovine mastitis. Am. J. Vet. Res. 20: 287-296. 
(29) Hovmand, H. C., and Overby, A. J. 1955. Elimination and bacteriological effect of 
‘*tardocillin’’ during a collective campaign of streptococcal mastitis. (In Danish), 
Nord. Vet.-Med. 7: 833-842. 
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