When does a book become public domain? #general

Judy Petersen

Could someone please explain to me when a book becomes public domain?
How is copyright status renewed?
I would like to use information >from a book for my Hodmezovasarhely
ShtetLinks site, but I don't know who would have the copyright.
The book was written in 1943. I want to use community and census lists
of names that are found in the book.
Thanks very much,

Judy Petersen
Fort Collins, CO

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