Sir William Johnson Papers, New York State Library, Albany
A snapshot of the collection just prior to the devastating 1911 fire can be found in Richard E. Day, compiler. Calendar of the Sir William Johnson Manuscripts in the New York State Library. Documents of the Assembly of the State of New York, Volume 40, no. 69, part 2. Albany: J.B. Lyon Company, 1909. Available on-line at: Sir William Johnson Papers in the New York State Library
A guide to the surviving collection following the fire can be found here: Sir William Johnson Papers in the New York State Library
The collection, partially reconstructed, was published in 14 volumes as The Papers of Sir William Johnson. Prepared for publication by the Division of Archives and History. Albany, The University of the State of New York, 1921-65.
Contents: v. 1. Period of settlement 1738-1744, King George's War 1744-1748, period of peace 1749-1755, preliminary campaigns 1755-- v. 2. Preliminary Campaigns, 1755-1756, Seven Years' War -- v. 3. The Seven Years' War -- v. 4. Post-war period, 1763-1774 -- v. 5. Post-war period, 1763-1774 -- v. 6. Post-war period, 1763-1774 -- v. 7. Post-war period, 1763-1774 -- v. 8. Post-war period, 1763-1774 -- v. 9. Period of settlement 1738-1744, King George's War 1744-1748, period of peace 1749-1755, preliminary campaigns 1755-1756 -- v. 10. The Seven Years' War, the Indian uprising -- The Indian uprising 1764-1765 -- v. 12. Indian affairs to treaty of Fort Stanwix 1766-1768, Indian affairs and land development 1769-1774 -- v. 13. William Johnson's affairs 1738-1755, Sir William's affairs 1756-1758, the Niagara campaign 1759, Warren Johnson's journal 1760-61, the Detroit journal 1761, building Johnson Hall 1763, land and Indian affairs 1764-1773, Sir William's passing 1774 -- vol. 14. General index.