Whereas the 1966 WRTH cover was a dull, blue-grey colour,
the 1966 Summer Supplement was in a bright blue with a semi-hard cover. There
was also an updated 'Shortwave Stations Of The World' insert in a blue paper in
the center of the book, numbered between A and P!
Articles also started appearing, such as 'Repair Your Radio' and 'Learning Languages'.
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