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1.
How personal & Internet security works / Preston Gralla. by Series: How it works
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Indianapolis, Ind. : London : Que/Sams ; Pearson Education [distributor], 2006
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Availability: Items available for loan: Biblioteca Juan Bosch (1)Call number: HV 6773 G744h 2006.

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2.
How the Internet works / Preston Gralla ; [illustrated by Sarah Ishida, Mina Reimer & Stephen Adams]. by
Edition: Millenium ed.
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Indianapolis, IN : Que, c1999
Availability: Items available for loan: Biblioteca Juan Bosch (1)Call number: TK 5105.875 G744h 1999.

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