Sarah Guthals

Computer security (1)

Computing and Information Technology (2)

Data encryption (1)

Digital Lifestyle and online world: consumer and user guides (1)

E-book readers, tablets and other portable devices: consumer / user guides (1)

Electronics and communications engineering (1)

Encyclopaedias and reference works (1)

Mobile phone technology (1)

Mobile phones and smartphones: consumer / user guides (1)

Reference works (1)

Reference, Information and Interdisciplinary subjects (2)

Research and information: general (1)

Technology, Engineering, Agriculture, Industrial processes (1)

Technology: general issues (1)

Telephone technology (1)

WAP (wireless) technology (1)

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