Airchecks of LA or SF radio from mid 1970s?

I'm trying to find some full length airchecks from the LA and SF areas from 1973-1978. Of particular interest would be KNX-FM from 1975-1977, and KKDJ from about 1974 until a bit before they became KIIS-FM. I'd also love to find some KROQ from 1978-1980. And any other "Boss Radio" airchecks. (KHJ, etc). I'm looking for the full length ones, not "scoped" stuff. I just got a working reel-to-reel deck again, and I've been transcribing to MP3 some of my old recordings. One thing I will be posting in the next few weeks is the last days of KNX-FM before they became KKHR. One thing I've noticed from listening to these is that Radio used to be good. Voice tracking and automation abuse killed popular radio. (Although KNX-FM was automated and it was one of the greatest FM stations of all time. Automation is a tool; when used correctly it can sound great, when used poorly, it sounds like Chear Channel's HD2 stations.)