Martin,
The book I have (although not at my fingertips now) was written by Dr. Pete Ho who was my prof for the first LP course I took. It's a very good book although probably a bit dated now it was published in the mid 70s and the code is in Fortran IV.
>Do you know of a good book on the subject?
>
>>There are a variety of textbooks that deal with linear programming from programming as distinguished from mathematical approach.