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Asimov, Isaac; Ellison, Harlan
Harlan and Asimov Isaac. Ellison
Harlan-Isaac Asimov Ellison
Harlan; Isaac Asimov Ellison
Harlan Isaac Asimov Ellison
Harlan, and Asimov, Isaac Ellison

See also:

Ellison, Harlan - Foreword By Isaac Asimov
Ellison, Harlan [Signed]; Isaac Asimov; Illustrated by Mark Zug
Asimov, Isaac (screenplay By Harlan Ellison)