TY - BOOK ED - Symposium on the use of isotopes in studies of nitrogen metabolism in the soil plant animal system TI - Isotope studies on the nitrogen chain T2 - OIEA Proceedings series PY - 1968/// CY - Viena PB - IAEA KW - NITROGENO, ISOTOPO DEL -CONGRESOS N1 - Proceedings jointly organised by the IAEA and the FAO in co-operation with the Joint commission on applied radioactivity [ICSU]; Bibliografía al final de cada artículo ER -