REFERENCES
- Cohart, E. M. and Kandle, R. P.: The effects of a ragweed control program on ragweed pollen counts. J. Allergy 30: 4, 1959.
- Scheppegrell, W.: Hay Fever and Asthma. Philadelphia, Lea & Febiger, 1922.
- Durham, O. C.: Pollen prevalence and pollen-free areas. J.A.M.A. 148: 716–720 (March) 1952.
REFERENCES
- Irwin, S.: Drug screening and evaluative procedures. Science 136: 123–128 (April) 1962.
- Responsibility for clinical trials. Brit. M. J. 1:1064–1065 (April 14) 1962.
REFERENCE
- Symposium: Road accidents. Practitioner 188:441–523 (April) 1962.