Anyone collect these? I picked up a bunch for $1.50 apiece the other day - drawn by the appeal of 45s from the band who didn't believe in 45s - I picked up Atlantic 45s of "Whole Lotta Love," "Black Dog," "D'yer Maker," and a Swan Song 45 of "Trampled Underfoot." There seems to be a few seconds of unique intro noise at the beginning of "Black Dog" - are any of these unique single mixes? Like many Atlantic 45s that I have collected, these are generally cut pretty hot and sound pretty good. Were there ever picture sleeves for any of these U.S. singles?