The field work for 1970 consisted of rerunning for the fifth year transects in aspen stands that had previously been selected for the study. These transects were to determine the number of new aspen shoots in each stand, the number of dead trees, and the number of shoots that have matured to a diameter of 6 feet (The size coincided to be mature tree). Project Number 130.
Hilston, Neal and Beetle, Alan A.
"The Variation in and Ecology of Aspen in Wyoming,"
Jackson Hole Research Station Annual Report: Vol. 1970
, Article 12.
Available at: http://repository.uwyo.edu/jhrs_reports/vol1970/iss1/12