I just noticed this remark, and I have to reply, because I've been going through this crazy Zeppelin 3 revival myself. Especially Tangerine, Out on the Tiles, Celebration Song and Gallows Pole. You know what makes it the perfect album? You know how they put at least one long, slow, rather bombastic blues song on all of their early albums? Well on Zep 3, even that song, "Since I've Been Loving You" is totally incredible.
Gorgeous photo set, by the way.