Combine whole wheat flour, 1 cup all-purpose flour, undissolved yeast, sugar, and salt in a large mixer bowl. Heat water, milk, molasses, and butter until very warm (120°to 130°F). Gradually add to flour mixture. Beat 2 minutes at medium speed of electric mixer, scraping bowl occasionally. Stir in enough remaining flour to make a soft dough. Knead on lightly floured surface until smooth and elastic, about 8 to 10 minutes. Cover; let rest 10 minutes.
Divide dough into 32 equal portions; shape each into smooth balls. Place in 2 greased or parchment lined 9-inch square pans. Cover; let rise in warm, draft-free place until doubled in size, about 1 hour.
Bake at 375°F for 20 to 25 minutes or until done. Remove from pans; cool on wire racks.