<And Led Zep never released a single.The songs the radio played had to be taken from the album.>
Atlantic Records released around 11 Zep singles. I had a couple back then (and more now). Whole Lotta Love on a 7 incher had most of the Page bow/echoplex/screaming stuff edited out for AM radio play. FM radio was known for spinning album cuts.
http://ledzeppelin.alexreisner.com/discography.html
