Resources for Soda Bottles? 1920-1080?
I'm still fairly new with my soda bottle collection and am starting to want to figure out the age of all my bottles. Some are obviously easy to figure out based on the number in the base, but others are either hard to read or don't have the handy number.
Any resources you would recommend for dating soda bottles? I'm mostly focused on bottles from 1920-1980 which seem to be difficult to find info on. I've seen lots of resources on earlier than that though.
Anyways, any help appreciated! Books, websites, whatever will do!