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In page Jerry Pournelle:

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Pournelle was one of the few close friends of H. Beam Piper and was granted by Piper the rights to produce stories set in Piper's Terro-Human Future History. This right has been recognized by the Piper estate.[citation needed] Pournelle worked for some years on a sequel to Space Viking but abandoned this in the early 1990s, however John F. Carr and Mike Robertson completed this sequel, entitled The Last Space Viking, and it was published in 2011.[3]