Chena River Lakes Project revegetation study- Three-year summary - USACE-p266001coll1-6429
https://commons.wikimedia.org/wiki/File:Chena_River_Lakes_Project_revegetation_study-_Three-year_summary_-_USACE-p266001coll1-6429.pdf
during August 1979. The first was a seeded brome and the second was a balsam pop lar seedling. Measurements were made on both the upper and lower leaf surfaces