I made this bread with one cup of graham flour, one cup of bread flour, and two cups of all purpose flour. (kingarthurflour.com)
You don't need to use graham flour for this recipe, since that stuff is similar to the whole wheat flour you find in your local supermarket. (topsecretrecipes.com)
I have been experimenting with substituting graham flour for whole wheat and it is really good! (kingarthurflour.com)