1 Subjects: “...Computer networks / Security measures / http://id.loc.gov/authorities/subjects/sh94001277...”

2 Subjects: “...Aeronautics / Security measures / United States...”

3 Subjects: “...Pocket computers / Security measures...”

4 Subjects: “...Computer networks / Security measures / http://id.loc.gov/authorities/subjects/sh94001277...”

5 Subjects: “...Computer networks / Security measures / http://id.loc.gov/authorities/subjects/sh94001277...”

6 Subjects: “...Infrastructure (Economics) / Security measures / http://id.loc.gov/authorities/subjects/sh...”

7 Subjects: “...Computer networks / Security measures / http://id.loc.gov/authorities/subjects/sh94001277...”

8 Subjects: “...Computer networks / Security measures / Government policy...”

9 Subjects: “...Nuclear facilities / Security measures...”

10 Subjects: “...Logistics / Security measures...”

11 Subjects: “...Computer networks / Security measures / http://id.loc.gov/authorities/subjects/sh94001277...”

12 Subjects: “...Computer networks / Security measures / http://id.loc.gov/authorities/subjects/sh94001277...”

13 Subjects: “...Computer networks / Security measures / http://id.loc.gov/authorities/subjects/sh94001277...”

14 Subjects: “...Transportation / Security measures...”

15 Subjects: “...Computer networks / Security measures / http://id.loc.gov/authorities/subjects/sh94001277...”

16 Subjects: “...Computer networks / Security measures / http://id.loc.gov/authorities/subjects/sh94001277...”

17 Subjects: “...Public utilities / Security measures / fast...”

18 Subjects: “...Transportation / Security measures / fast...”

19 Subjects: “...Tourism / Security measures...”

20 Subjects: “...Computer networks / Security measures / http://id.loc.gov/authorities/subjects/sh94001277...”