'Sub-micron Scale Trace Element Distributions in Zircon' and 'The North-South Gradient in Free Tropospheric CO2: Implications for Surface Exchange'

"Sub-micron Scale Trace Element Distributions in Zircon" and "The North-South Gradient in Free Tropospheric CO2: Implications for Surface Exchange," Amy Hofmann and Gretchen Aleks, graduate students, Division of Geological and Planetary Sciences, Caltech.