Contained in 13 boxes the Correspondence Series (1970-2003) includes letters between Lewis and others interested in the field of horticulture and horticultural therapy. Some letters of interest includes those of Gert Groening who was a professor of urban horticulture and landscape architecture, Stephen Kaplan, professor of psychology at the University of Michigan, Rachel Kaplan, professor at University of Michigan School of Natural Resources and Environment and Paula Diane Relf, professor emeritus, Virginia Tech University.
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