The Development of the C Language* by Dennis Ritchie (1996)(sites.harvard.edu)
sites.harvard.edu
The Development of the C Language* by Dennis Ritchie (1996)
http://sites.harvard.edu/~lib113/reference/c/c_history.html
http://sites.harvard.edu/~lib113/reference/c/c_history.html
Just recently, fragments of the earliest Unix OS source code and B interpreter were discovered [0]. Now, the earliest Unix for the PDP-7 and PDP-11 [1] can run under emulation thanks to the incredible efforts of Warren Toomey and others at the Unix Heritage Society [2].
[0] https://github.com/DoctorWkt/pdp7-unix
[1] https://github.com/DoctorWkt/unix-jun72
[2] http://www.tuhs.org