Theodore Roosevelt National Park
The 1992 field season began in early May with a meeting between the principal investigator and NPS Unit Technical Representatives. The primary objectives of the second field season was to 1) continue with the initial survey so that the number and distribution of exotic plant species within the Park could be estimated, 2) take low-level aerial photographs (slides) of the South Unit so that general areas of leafy spurge infestations could be mapped, 3) continue to evaluate the existing ecological effects of exotics on the native constituents, and 4) estimate density and composition of exotics within the soil seed bank.
Butler, Jack L.
"Exotic Plants of Theodore Roosevelt National Park,"
University of Wyoming National Park Service Research Center Annual Report: Vol. 16
, Article 28.
Available at: http://repository.uwyo.edu/uwnpsrc_reports/vol16/iss1/28