These two titles were original published in hardback only by Chatto & Windus in 1954 & 1956, before Penguin published them as a single paperback volume in 1959.
Almost every copy I’ve handled or either book has the same age related defects. The cheap, post war paper discolours in the area of the fly page (not protected by the dust jacket). The dust jackets are also fairly fragile with most copies now having minor loss, chipping at the top. Since Heaven & Hell, has a half red spine (the first colour to fade) most copies are blue at the top, pinkish at the bottom.
The British 1st edition of Doors of Perception (of which there were 4 printings impressions) attracts the most interest from collectors, with the excellent Jack Woodcock dust jacket, which wasn’t retained for the dull,academic looking US edition published by Harper & Brothers.
Obviously these two books became a seminal part of the early-mid sixties reading list for the curious….and helped fuel mainstream interest in hallucinogens.