Fuel is precious these war days- it's real economy if you have a combination coal-gas or coal-electric stove, to preheat your oven with coal or wood and finish the baking with the second fuel.
Peet, Louise J.
"Two-Fuel Ranges Mean Economical Baking,"
Farm Science Reporter: Vol. 3
, Article 5.
Available at: https://lib.dr.iastate.edu/farmsciencereporter/vol3/iss2/5