1. Nitrogen abundances and isotopic compositions in lunar samples;Becker,1975
2. Solar nitrogen: evidence for a secular increase in the ratio of nitrogen-15 to nitrogen-14;Kerridge;Science,1974
3. Characterization of lunar nitrogen components;Becker,1976
4. Solar wind nitrogen: mechanism for isotopic evolution;Kerridge,1977
5. Nitrogen isotope systematics of two Apollo 12 soils;Becker,1978