JGMF spoke with Richard Greene a few times in ca. 2012. Among other things, Richard was kind enough to go page-by-page through his 1973 datebooks. He placed himself at the Plant this date. He also remembered doing a KSAN broadcast from there, and JGMF may have crossed some wires. We now think that RG was at the Plant doing some session work (we don't know for whom) on 4/28, but not OAITW. Let's just imagine this was afternoon making some money at the Plant, evening fiddling with the guys in Berkeley.