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I welcome speaking invitations to garden clubs, environmental organizations, businesses, civic, and religious groups.
To make arrangements, please email or call me:
David Koetje, PhD
Department of Biology
1726 Knollcrest Circle SE
Calvin University
Grand Rapids, MI 49546, USA
Email: david.koetje@calvin.edu
Office phone: (616) 526-7047
Refugia Gardening 