American Philosophical Society http://www.amphilsoc.org/

Bartram’s Garden http://www.bartramsgarden.org

Benjamin Franklin House Foundation http://www.bfhfoundation.org/ 

Benjamin Franklin – WIKIPEDIA – http://en.wikipedia.org/wiki/Benjamin_Franklin

Carolus Linnaeus – WIKIPEDIA – http://pam.wikipedia.org/wiki/Carolus_Linnaeus 

Collinsonia Canadensis – WIKIPEDIA – http://en.wikipedia.org/wiki/Collinsonia_canadensis

Peter Collinson – WIKIPEDIA – http://en.wikipedia.org/wiki/Peter_Collinson_(botanist)c

Quakers in the World http://www.quakersinthe world.org/quakers-in-action/249

Society of Antiquaries of London http://www.sal.org.uk/

The Garden Museum http://www.gardenmuseum.org.uk

The Library Company of Philadelphia http://www.librarycompany.org/

The Linnaean Society http://www.linnean.org

The Painshill Park Trust http://www.painshill.co.uk

Quakers in the World https://www.quakersintheworld.org/quakers-in-action/249/Peter-Collinson

The Royal Botanic Gardens, Kew http://www.kew.org

The Royal Society http://www.royalsociety.org

Luton Hoo Walled Garden Project http://lutonhooestate.co.uk