11To Benjamin Franklin from Cadwallader Colden, 24 October 1752 (Franklin Papers)
Draft: New-York Historical Society I now send back to you Wilson on Electricity for the use of...
12To Benjamin Franklin from Cadwallader Colden, 29 November 1753 (Franklin Papers)
Draft (letter and enclosure): New-York Historical Society; copy (enclosure only): American...
13To Benjamin Franklin from Cadwallader Colden, 13 February 1754 (Franklin Papers)
ALS : American Philosophical Society The want of an opportunity is the only reason why I have not...
14To Benjamin Franklin from Cadwallader Colden, 2 April 1754 (Franklin Papers)
Draft: New-York Historical Society I should have acknowleged your favour of the 1st of January...
15To Benjamin Franklin from Cadwallader Colden, 2 April 1754 (Franklin Papers)
Draft: New-York Historical Society Any knowlege I have of the winds and other Changes which...
16To Benjamin Franklin from Cadwallader Colden, 20 June 1754 (Franklin Papers)
Draft: New-York Historical Society; also transcript: Library of Congress I inclose the papers...
17To Benjamin Franklin from Cadwallader Colden, 1 October 1765 (Franklin Papers)
Letterbook copy: New-York Historical Society My regard to you makes me give you the trouble of...