Now which you mention it, the main two tracks manage to deficiency minimal bass, (in addition to a bass drum strike just ahead of the fade from Custard Pie). But then “In My Time of Dying” appears to have some extra bass… not sure what was going on here, https://archerruupm.worldblogged.com/32476057/the-fact-about-led-zeppelin-gold-records-that-no-one-is-suggesting