Harrison, R. K. Numbers (Wycliffe Exegetical Commentary). Chicago: Moody Press, 1990. ISBN: 0802492614.
Very good hardcover, 6 x 9 inches, clean text, xvi., 452 pp. Ex Bible college library with the usual extras. Very good. Hardcover. 
"With dependable work on the Hebrew text, this is one of the most valuable evangelical works on Numbers, written by then General Editor of NICOT. Readers will find it to be a well-rounded commentary treating grammatical, historical, and theological issues." - Evans, A Guide to Biblical Commentaries and Reference Works.