Perter Collinson Mill Hill
...seeds across the sea

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American Philosophical Society

Bartram's Garden

Benjamin Franklin House Foundation 

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Carolus Linnaeus - WIKIPEDIA - 

Collinsonia Canadensis - WIKIPEDIA -

Peter Collinson - WIKIPEDIA -

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Society of Antiquaries of London

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The Library Company of Philadelphia

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Quakers in the World

The Royal Botanic Gardens, Kew

The Royal Society

Luton Hoo Walled Garden Project