“Hamburgers come in three sizes on white or wheat buns, with a variety of toppings.” — Fodor’s Japan, 18th edition, p. 89, par. 1
The issue: There is a saying that the U.K. and U.S.A. are two countries divided by a common language. They are not the only ones.
I am a Canadian. I lived in Bellingham, WA for nearly two years. Some of the language differences were confusing the first time I ran into them.
One was the question “White or wheat?” for bread type. They are both wheat, no? (The Canadian usage is “White or brown?”.)
Now, we see this usage in a book that could reasonably be expected to be bought and used by more than just people from the U.S.A.