Witherspoon, John

Philadelphia, PA — Site of the Second Continental Congress and of the signing of the Declaration of Independence; access is available through a Park Ranger tour.
Princeton, NJ — Completed in 1756, it housed the entire “College of New Jersey” for nearly 50 years. During the war, both British and Continental troops quartered there.

But Adams did not just read books. He battled them. The casual presumption that there is some kind of rough correlation between the books in the library of any prominent historical figure and the person’s cast of mind would encounter catastrophe with Adams, because he tended to buy and read book with which he profoundly disagreed. Then, as he read, he recorded in the margins and at the bottom of the pages his usually hostile opinions of the arguments and authors.... [T]he Adams marginalia constitute evidence more revealing of his convictions about political theory than any of his official publications.

Joseph J. Ellis
Passionate Sage: The Character and Legacy of John Adams (1993)