We only have 3 books with the hour-glass girl & penguins. All three have the alternating nude/dressed penguins, all three have the "Showplace of the stars...Nothing finer in the world" slogan. The manu-marks are different on the three.

I used to see the Sands penguin feature books, and "assumed" we already had them. Then I heard there were 7 (I think) varieties (excluding differences in the manu-marks). Now we rarely see them anymore.