A History of UNIX before Berkeley: UNIX Evolution: 1975-1984 - http://www.darwinsys.com/history/hist.html

Evolution of C - http://www.faqs.org/docs/artu/c_evolution.html

• pcc history "he compiler is based on the original Portable C Compiler by Stephen C. Johnson, written in the late 70's"

http://pcc.ludd.ltu.se/pcc_history/

• Byte Magazine Volume 08 Number 08 - The C Language 1983 https://archive.org/details/byte-magazine-1983-08

I think you mean this one:

https://en.wikipedia.org/wiki/C_(programming_language)

• https://www.bell-labs.com/usr/dmr/www/chist.html

http://bitsavers.trailing-edge.com/pdf/att/unix/System_V_Release_2/UNIX_Programmers_Manual_Vol_2_System_Calls_and_Library_Routines_1986.pdf

https://www.bell-labs.com/usr/dmr/www/

And the ANSI C Rationale (C89) is at

https://www.lysator.liu.se/c/rat/title.html

USERS’ REFERENCE TO B ON MH-TSS https://www.bell-labs.com/usr/dmr/www/bref.pdf

A TUTORIAL INTRODUCTION TO THE LANGUAGE B https://www.bell-labs.com/usr/dmr/www/btut.pdf

C Reference Manual (1975) https://www.bell-labs.com/usr/dmr/www/cman.pdf

Recent Changes to C (1978) https://www.bell-labs.com/usr/dmr/www/cchanges.pdf

The C Language Calling Sequence (1981) https://www.bell-labs.com/usr/dmr/www/clcs.pdf

Variable-Size Arrays in C 1990 https://www.bell-labs.com/usr/dmr/www/vararray.pdf

The Development of the C Language (1993) https://www.bell-labs.com/usr/dmr/www/chist.pdf

Programming in C - A Tutorial https://www.bell-labs.com/usr/dmr/www/ctut.pdf

Rationale for American National Standard for Information Systems - Programming Language - C https://www.lysator.liu.se/c/rat/title.html