1. Determination of sulfuric acid, total particle-phase acidity and nitric acid in ambient air;Appel;Final Report to the California Air Resources Board for Contract No. A6-209-30. NTIS Report PB 80-145980,1979
2. Simultaneous nitric acid, particulate nitrate and acidity measurements in ambient air;Appel;Atmospheric Environment,1980
3. Sampling of nitrates in ambient air;Appel;Atmospheric Environment,1980
4. Evaluation of techniques for sulfuric acid and particulate strong acidity measurements in ambient air;Appel;Atmospheric Environment,1980
5. Evaluation and development of procedures for determination of sulfuric acid, total particle phase acidity and nitric acid in ambient air-phase II;Appel;Final report to the California Air Resources Board for contract no. A8-111-31,1980