204 RADIOISOTOPES IN BIOLOGY AND AGRICULTURE 



It has been possible to refer to relatively few papers from among many, 

 especially on the more widely used isotopes. The choice of references 

 was often difficult and primarily based upon the suitability of the paper 

 for illustration of certain points of technique. Thus it was not feasible 

 to give due recognition to numerous contributions of outstanding scien- 

 tific merit, both in the early days of isotope usage and in recent years. 



GENERAL REFERENCES 



1. Hollander, J. M., I. Pcrlman, and G. T. Seaborg: Table of Isotopes, Revs. Mid. 

 Phys., 25: 4(J9-G51 (1053). 



2. Maximum Permissible Amounts of Radioisotopes in the Human Body and Maxi- 

 mum Permissible Concentrations in Air and Water, Xail. Bur. Standards Hand- 

 book 52, Mar. 20, 1953. 



3. Monier- Williams, G. W.: "Trace Elements in Food," John Wiley & Sons, Inc., 

 New York, 1950. 



4. Maynard, Leonard A.: "Animal Nutrition," McGraw-Hill Book Company, Inc., 

 New York, 1951. 



5. Farris, Edmond J., and John Q. Griffith, Jr., eds. : "The Rat in Laboratory Investi- 

 gation," 2d ed., J. B. Lippincott Company, Philadelphia, 1949. 



6. Curtis, Otis F., and Daniel G. Clark: "An Introduction to Plant Physiology," 

 McGraw-Hill Book Company, Inc., New York, 1950. 



7. Beeson, K. C: The Mineral Composition of Crops with Particular Reference to 

 the Soils in Which They Were Grown, U.S. Dept. Agr. Misc. Pub. No. 369, March, 

 1941. 



8. Sollmann, Torald: "A Manual of Pharmacology," W. B. Saunders Company, 

 Philadelphia, 1949. 



9. Fairhall, Lawrence T. : "Industrial Toxicology," The Williams & Wilkins Company, 

 Baltimore, 1949. 



