Here is an interesting old book/large softcover pamphlet titled " 1940 RADIO and TELEVISION Data Book ( RADIO NEWS )"; published by Ziff-Davis Publishing Company Chicago Illinois 1939.  Lots of neat vintage radio and TV articles, with diagrams, troubleshooting, how to build your own, etc.  My favorite is the old ' Treasure Finder '... quite a contraption, but probably very cutting edge for the time!  ALSO includes a letterhead from the old National Radio Institute, with notes/writing on the back. 

Large format softcover pamphlet style, with stapled binding, with 66 pages, measures ~ 11 1/8" x 8 3/8", well illustrated with diagrams and photos, and condition is vintage used, Good or better condition, stapled binding solid, clean pages and complete, some wear on edges and corners, some stains.  This will make a nice addition to your collection or library.  S/H $4.95; I do combine shipping on multiple auctions won for a savings to you on shipping. See my other auctions for more tokens, coins, and misc. items.