Now which you point out it, the main two tracks manage to lack minimal bass, (other than a bass drum strike just prior to the fade outside of Custard Pie). But then “In My Time of Dying” seems to have some extra bass… undecided what was going on below, https://goldrecordoutlet.com/shop/led-zeppelin-laser-etched-lyrics-limited-edition-vinyl-framed-record-display/