This is the GM original (reprint)  Service or Workshop Manual "Supplement" for the 1975 Chevrolet range as shown below.

Covers the maintenance proceedures and pull down as provided..

If you have a 1975 Chev.. you will also  need the 1974 GM Manual as this forms the basis of the full manual set.. you will need to purchase the 74 Manual also.

Covers:

Corvette

Chevelle

Camaro

Monte Carlo

Nova