There's a new book on progressive rock, all about the "classic" era. The
book is "print on demand" from Lulu.com (same guy who started Red Hat
linux distro). Really high quality printing, and great cover from Matt
Howarth.

http://www.progressiverock.com/

Artists covered: Daevid Allen, Amon Düül II, Jon Anderson, Ange,
Aphrodite’s Child, Area, A.R. & Machines, Ashra, Atomic Rooster, Kevin
Ayers, Il Balletto di Bronzo, Banco Del Mutuo Soccorrso, Barclay...