Border security
The United States has two of the longest unfortified borders in the world . . . and people arrive daily by air from outside the country, too. At those borders and airports are the border security officers who are on the front lines of making sure our nation is protected. They use their training, ski...
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| Format: | EBOOK |
| Other Format: | BOOK |
| Language: | ENGLISH |
| Published: |
National Highlights Inc
2016
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| Series: | On a mission! |
| Subjects: |