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What reference material do you use to determine how many more artillary, bombers, bombs, bullets, fighters, rounds, shells, ships, submarines, tanks, tractors, trucks, etc. could realistically produce? How do you determine what materials could be used to produce different items than they were used for IOTL? I am considering writing what would probably turn out be a very poor timeline. At least I can try to make it somewhat realistic. Anything else I should know on this subject?
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