481From Benjamin Franklin to William Strahan, 2 June 1750 (Franklin Papers)
MS not found; facsimiles of ALS : Historical Society of Pennsylvania and Boston Public Library...
482Last Will and Testament, 22 June 1750 (Franklin Papers)
ADS (mutilated): American Philosophical Society I Benjamin Franklin of the City of Philadelphia...
483From Benjamin Franklin to Cadwallader Colden, 28 June 1750 (Franklin Papers)
ALS : New-York Historical Society I wrote a Line to you last Post, and sent you some Electrical...
484To Benjamin Franklin from Peter Collinson, 3 July 1750 (Franklin Papers)
ALS : Historical Society of Pennsylvania I received thy Letter from the Trustees and Bill per...
485To Benjamin Franklin from Peter Collinson, 11 July 1750 (Franklin Papers)
ALS : Library Company of Philadelphia If I catch the Bagg before its taken away its more than I...
486To Benjamin Franklin from Jonathan Belcher: Warrant for Payment, 26 July 1750 (Franklin Papers)
DS : Huntington Library By His Excellency Jonathan Belcher Esqr: Captain General and Governor in...
487From Benjamin Franklin to Peter Collinson, 27 July 1750 (Franklin Papers)
Copy: American Academy of Arts and Sciences Mr. Watson I believe wrote his Observations on my...
488From Benjamin Franklin to Peter Collinson, 29 July 1750 (Franklin Papers)
Copy: American Academy of Arts and Sciences As you first put us on Electrical Experiments by...
489Opinions and Conjectures, [29 July 1750] (Franklin Papers)
Copy: American Academy of Arts and Sciences Opinions and Conjectures concerning the Properties...
490Paper on the Academy, [31 July 1750] (Franklin Papers)
MS Minutes of the Common Council: Free Library of Philadelphia Within a few weeks of their...