House ads for Kirby Unleashed: A "King Kirby" Portfolio (1971); printed in (top) Jimmy Olsen #147 (March 1972) and (bottom) Forbidden Tales of the Dark Mansion #5 (May-June 1972 )
Not technically a DC publication (but since it was advertised in DC Comics, why not include it here!), Kirby Unleashed was republished in large-format book form (with additional material) by TwoMorrows in 2004. If you're a Kirby fan, this is well worth picking up (if you spot a copy anywhere!). Or, you can buy a digital version of Kirby Unleashed from TwoMorrows, here!