00297nam a2200097Ia 4500008004100000082002500041100001800066245006900084260003800153300000800191140113s9999    xx            000 0 und d  a57+63:621.039.8   J5  a"Comar, C.L."  aRadio Isotopes in Biology andAgriculture: Principles & Practice   a1955bMcGraw Hill BookcAmsterdam  a481