publisher: Baen publish date: May 1st 1988
format: mass market paperback
language: English
ISBN:
0671654047 (9780671654047)
publisher: DAW publish date: February 1973
language: English
ISBN:
0879970413 (9780879970413)
publisher: Tandem Books publish date: 1974
pages: 187
language: English
ISBN:
0426138058 (9780426138051)