1. The effects of low levels of ozone on Pinto beans, Phaseolus vulgaris L;Engle,1967
2. Influence of low levels of ozone on flowering of carnations;Feder;Phytopathology,1968
3. Ozone: depression of frond multiplication and floral production in duckweed;Feder;Science, N.Y.,1969
4. The effect of chronic exposure to low levels of ozone upon the growth and development of geranium cultivar Olympic Red;Feder;Phytopathology,1969
5. Diseases of crops and ornamental plants incited by air pollutants;Heggestad;Phytopathology,1968