A first edition of "Trixie Belden and the Mystery at Bob-White Cave." There was no 'glossy' version of this book; only the first ten were issued in that series. This was the 'cameo' series, which included the first 13 books (the last three of which were first editions). I always felt sorry for the fish and worms caught in the cave, since they were going to be sold for medical experimentation. Even in the 4th grade I objected to vivisection.