136 posted 3 years ago by SkiSkiUSMC 3 years ago by SkiSkiUSMC +136 / -0 71 comments share 71 comments share save hide report block hide replies
sets of old encyclopedias are helpful, could get a couple of sets and compare. Pre WW1 to the 1980s-2000
https://www.ebay.com/itm/124930697906?hash=item1d16732ab2:g:ls4AAOSwvQJhWLtw
I also like looking through: https://archive.org/ & https://www.gutenberg.org/