1. News and notes
2. News and notes
3. Survey of Ragweed Pollination in the New York Metropolitan District in 1946;Walzer;New York State J. Med,1947
4. Survey of Ragweed Pollination in the New York Metropolitan District in 1947;Walzer;New York State J. Med,1948
5. Surveys of Ragweed Pollination in the New York Metropolitan District in 1948 and 1949;Wiseman;New York State J. Med,1950