Massive reference / source for scientific computing in Fortran.  Industrial-strength subroutine code listings and explanations for countless functions.  About 2400 pages plus extensive cross-indexes.  Includes the detailed guide book for each of the three areas.

This is the 1989 version, but still latest when purchased direct from Visual Numerics in 1995.

Provided in large 3-ring binders in excellent condition.  See the pictures which are just a glimpse into this gigantic reference.