Among the contributors to Challenger #28 are:
James Bacon, London, U.K.
Sheryl Birkhead, Gaithersburg MD
Warren Buff, Raleigh NC
Randy Childers, Bowling Green KY
Randy B. Cleary, Madison AL
Liz Copeland, Bellevue WA
Dennis Dolbear, Jefferson LA
Mike Estabrook, Acton MA
Brad Foster, Irving TX
Alexis Gilliland, Arlington VA
Mike Glyer, Monrovia
Laura Haywood-Cory, Durham NC
John Purcell, College Station, TX
Charles Williams, Knoxville TN
Gregory Benford, Joseph Green, Toni Reinhardt, Mike Resnick, c/o Challenger
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