Claim: Preceded by New Writings in SF 19, New Writings in SF 20 was first published in hardcover by Dennis Dobson, a British book publisher who was the eponymous founder of a small but respected company in London, in 1972.
Evidence: New Writings in SF 19 It was first published in hardcover by Dennis Dobson in 1972, followed by a paperback edition issued by Corgi under the slightly variant title New Writings in SF -- 20 the same year. Dennis Dobson (1919 – 1978) was a British book publisher who was the eponymous founder of a small but respected company in London.