Historian and editor who has been at the head of the Princeton University Library since 1940, JULIAN P. BOYD is a Southerner whose firm conviction it is that Americans have enough strength of mind to resist subversive doctrine when they see it in print. His avocation for the next decade is to edit in some fifty volumes the definitive edition of Thomas Jefferson’s papers, a work to be published by the Princeton University Press under a grant of $200,000 from the New York Times Company. Mr. Boyd has written several historical works, among them a volume on the evolution of the text of the Declaration of Independence.