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This collection documents Lewis’s career as an internationally known pioneer, researcher, and scholar in horticulture therapy, and author of the landmark book Green Nature, Human Nature: The Meaning of Plants in Our Lives. The collection contains correspondence, speeches, research material, files associated with his employment, community and institutional projects, research, writing, lectures, and service with numerous national organizations and councils, unpublished and published manuscripts and reports, photographs and slides, and publications (his and those of other leaders in the field).