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Randall Garrett and Laurence M. Janifer wrote novels under the joint pen-name of Mark Phillips. Randall Garrett and Robert Silverberg wrote as Robert Randall. Also wrote as David Gordon, John Gordon, Darrel T. Langart , Alexander Blade, Richard Greer, Ivar Jorgensen, Clyde Mitchell, Leonard G. Spencer, S. M. Tenneshaw and Gerald Vance.
Randall Garrett and Laurence M. Janifer wrote novels under the joint pen-name of Mark Phillips. Randall Garrett and Robert Silverberg wrote as Robert Randall. Also wrote as David Gordon, John Gordon, Darrel T. Langart , Alexander Blade, Richard Greer, Ivar Jorgensen, Clyde Mitchell, Leonard G. Spencer, S. M. Tenneshaw and Gerald Vance.