Douglas Gomery's book The Hollywood Studio System was first published over twenty years ago, and has been republished in an expanded version. The first edition dealt only with the golden age of the Hollywood studio system (the 1930s and 1940s), though Gomery has now supplemented this with sections on the system's origins (1915-1930) and its death and rebirth (1950 onwards).
The Genius Of The System, by Thomas Schatz, also presents a studio-by-studio history of Hollywood. Gomery's book is drier than Schatz's, though; reading all the economic and corporate detail, you sometimes forget that the studios produced entertainment and art. Gomery takes the 'show' out of 'show business', though Schatz strikes a better balance. However, Schatz discusses only the major studios whereas Gomery finds room for them all.