1. Floristic summary of Manual of Vascular Plants of Northeastern United States and Adjacent Canada, Second Edition;Bennett;Botanical Review,1995
2. Floristic summary of 22 midwestern national parks;Bennett;Natural Areas Journal,1995
3. BIOLEFF: three databases on air pollution effects on vegetation;Bennett;Environ. Poll.,1995
4. A Synonymized Checklist of the Vascular Flora of the United States, Canada and Greenland;Kartesz,1994
5. The Plant-Book;Mabberley,1987