"Reader's Digest" Great Illustrated Dictionary: v. 1
by Robert F. Ilson
ISBN 13: 9780276352065
Format: Hardcover (936 pages) Publisher: Reader's Digest Published: 01 Feb 1984
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Mastering English Usage
by Robert F. Ilson, Janet Whitcut
ISBN 13: 9780135541715
Format: Hardcover (208 pages) Publisher: Phoenix ELT Published: 01 Jan 1994