yyyymm.DELZ.avg files are global 3-D monthly average layer thickness (m),
yyyymm.PS.avg files are global 2-D surface pressure (mb).
These are IEEE -N null format, 32 bits, big endian binary files generated by 
Fortran 90 on Cray. To read using fortran (with correct file format - 
see below) :

      parameter (imx=144,jmx=91,lmx=30)
      dimension delz(imx,jmx,lmx),ps(imx,jmx)
      read(unitdz) delz
      read(unitps) ps

Where imx = total number of longitudinal grid, 
      jmx = total number of latitudinal grid, 
      lmx = total number of vertical layers.

If you use fortran on a SGI machine, please use the following statement when
read the binary file:
      open(xx,file='xyz',status='old',access='sequential',form='system')