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"operation systems" » "operations systems", "operation system", "operational systems"

1
by Dulaney, Emmett A.
Published 2006
Novell Press
Subjects: ...Operating systems (Computers) / http://id.loc.gov/authorities/subjects/sh85094982...

2
by Docter, Quentin
Published 2012
Wiley
Subjects: ...COMPUTERS / Operating Systems / General / bisacsh...