Arnold Keller
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English Simplified (12th Edition)
Ellsworth, Blanche; Higgins, John A.
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When Machines Teach: Designing Computer Courseware
Keller, Arnold
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Exercises for English Simplified
Ellsworth, Blanche; Higgins, John A.; Keller, Arnold
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The Practical Technical Writer: Planning and Producing Documents- Professional Review Copy
Keller, Arnold
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