I always have it in mind to one day buy every DC book that was published in 1967 and read them all in the order they came out. The other periods that interest me are 1971-72, when DC did all the 52 pages for 25 cents comics. And the 1974 period when a great number of titles were 100 pages for 60 cents. Maybe if I ever sell off/give away most of my collection--I'll just focus on getting complete collections from those years.