Brian,
The Standard Catalog of Vintage Baseball Cards, by Bob Lemke (I think Bob was a member here until his passing 1-2 years ago) is well worth the investment.
The prices may not be 100% accurate, but all of your cards and sets will be listed. You will be able to see one cards value in relation to another. This really helps with sets where only 1-2 past sales can be found.
Personally, I wouldn't feel comfortable moving any of my rarer pre-war cards without having this resource at my side.
Hope all is well,
Eric
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