|Grinnell Hawaiian Missionary Stamps: Credits||
Hawaiian Missionary Stamps"
"Photographs of the Grinnell Hawaiian missionary stamps purchased by John A. Klemann from George H. Grinnell" and "Complete list of the seventy-one Grinnell Hawaiian missionary stamps". Images provided by Herbert A. Trenchard, PhD.
Map of Hawaii from Charles Wilkes, Narrative of the United States Exploring Expedition. Philadelphia: C. Sherman, 1844. Collection of Smithsonian Institution Libraries.
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