Determining Car Era?

[Amalynn]

So I model specifically from 1937-1942, and have found myself with a lot of difficulty knowing what models, roadnames, and liveries are appropriate for interchange in the time that I model. I was wondering if any of you might have suggestions for keywords, recommended reading, suggestions of anything specific, or just general advice to help guide decisions on whether or not a car at a swap meet, on ebay, or just for sale at a retailer is appropriate to my time period or not.