LED ZEPPELIN The Origins of the Species - How, Why and Where It All Began (2006 UK 320-page softback book by Adam Clayson who has traced every session, recording & live appearance made by each future member of Led Zeppelin & woven the results into a rich and insightful text containing a factually accurate 'family tree' of the future band & all their musical & professional colleagues, illustrated with photos to accompany the text)