Part 4 has title: British Public Record Office, Colonial Office, class 5 files.
These guides accompany 53 microfilm reels with title: Records of the British Colonial Office, class 5.
pt.1-3. Westward expansion, 1700-1783. The Board of Trade. The French and Indian War (1 v.) / guide compiled by Linda Womanski and Randolph Boehm -- pt.4. Royal instructions and commissions to colonial officials, 1702-1784 / guide compiled by Diane Dimkoff and Robert Lester -- pt.5. The American Revolution, 1772-1784 / guide compiled by Robert Lester