1 Subjects: “...Operating systems (Computers) / http://id.loc.gov/authorities/subjects/sh85094982...”

2 Subjects: “...Operating systems (Computers) / http://id.loc.gov/authorities/subjects/sh85094982...”

3 Subjects: “...Operating systems (Computers) / http://id.loc.gov/authorities/subjects/sh85094982...”

4 Subjects: “...Operating systems (Computers) / http://id.loc.gov/authorities/subjects/sh85094982...”