Here is a site where a guy takes and scans entire books that haven't updated their copywrite. Most of the books are back from the 60s or earlier but great info for us people who are into tube electronics... www.pmillett.com/technical_books_online.htm
The books are rather large in size (like 10Mb or more, PDF format) but well worth the download if you have high speed. I found the aeronautical ones of interest since they deal with early tube VHF equipment.
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