GRASS Category labels Question

[Peter G. Jacobs]

I am a new GRASS user and I was trying to include category labels on a map
without explicitly typing in each label.  I thought that since these
category numbers are present in the raster file support, it should be
possible to display the map with the category labels displayed (or
overlayed on top of the map), however, I did not have any luck finding a
d.* command to do this.

Also, I was wondering if there is a good book / manual available (hardcopy)
that I could find at a library or bookstore on the use of GRASS.

Thanks
Pete