1. Detection of atmospheric water vapor during the southern hemisphere spring and summer season on Mars;Barker;Bull. Amer. Astron. Soc.,1971
2. Ground-based observations of Mars and Venus water vapor during 1972 and 1973;Barker,1974
3. Mars: Detection of atmospheric water vapor during the southern hemisphere spring and summer season;Barker;Science,1970
4. Results of current Mars studies at the IAU Planetary Research Center;Baum,1974
5. Behavior of the Martian polar caps since 1905;Baum;Bull. Amer. Astrom. Soc.,1973