Some graduates/activities/teachers may not have a picture, or they may have a picture from another year. Email the goldenhawks.net webmaster if you can scan any part of a yearbook, or type in the names of your classmates from the yearbook.
Michael Christian, our c/o 74 and c/o 75 webmaster, has scanned the entire 1974 and 1975 yearbook! They are available online at AlumniClass.com ($10 onetime membership), or he can make you a CD copy if you contact him.
I'm not sure which yearbooks they are scanning, or what type subsciption you need to view them, but I received a notice from Classmates.com that my 1969 yearbook is now displayed at this link.