These American Publishers Corp Library editions are similar to the green and white APC library editions, but are red and white. They do not, however, use cover art from the picture covers and dust jackets on the front. They instead use a picture of Nancy from the neck up. They have the title above Nancy and then below the series title. Inside the one I have pictured above, are the Blue Multi-Pic II endpapers. The revised text is used for The Bungalow Mystery that I have. Also, the inside listing goes to The Clue in the Old Stagecoach. The Lilac Inn pictured below, however has the original text. Lilac Inn was revised in 1961. So, these library bindings may have been issued in this format for a number of years from the early 1960's until the later part of the 1960's. It is possible as well, that the puslishers of these library editions, used a copy of an original text even after it was revised in 1961. More research needs to be done to say for sure.
Click on the thumbnails below to see a larger version of the
Scan of #4 from Mark Woodcock