The above 2 editions have the same ISBN(s) but different publishing dates and, per the covers, both need a correction for the author's name to Robert Dunham.
And then the below edition also needs a correction to put a period after the author's middle initial and then be combined with the above:
http://www.goodreads.com/book/show/14... (Robert K. Dunham, wrong)
The above 2 editions have the same ISBN(s) but different publishing dates and, per the covers, both need a correction for the author's name to Robert Dunham.
And then the below edition also needs a correction to put a period after the author's middle initial and then be combined with the above:
http://www.goodreads.com/book/show/16... (Peter J Denning, wrong)