Before the internet if you were a Led Zeppelin collector these would have been essential to have to be able to know what had been produced up to the time of publication of these guides. Jam packed with photos of 45, LP, CD covers of both Bootlegs and legit worldwide releases . Even today it gives you hands on access to the original OG boot releases before the onslaught of 90's until current versions. A must have for any Zep fanatic.
