My Father attended all of these Indianapolis races and so collected their yearbooks.  
They are definitely a great vintage find for Collectors and Race Aficionados!
They've been in storage for 45+ years.
I am selling these yearbooks in a SET ONLY which include these years (see picture #3) = 
      1973, 1974, 1975, 1976, 1977, 1978, and 1979.
The yearbooks are published by Carl Hungness & Associates, Speedway, IN.
The books measure about 8 1/2" wide x 11 long and about 1/4"- 3/8" thick.
They weigh 9 pounds and 8.1 ounces.