This is, and I do not say this lightly, one of the most amazing articles I've read: Somewhere Nearby is Colossal Cave: Examining Will Crowther's Original "Adventure" in Code and in Kentucky, by Dennis Jerz. Dennis has done the definitive research on when Crowther wrote his version of Adventure, what parts of the final Adventure were Crowther's and what parts were Woods's, and even turned up Crowther's original source code in all of its FORTRAN glory.