Volume 8: Happy Mermaid Pig Visiting Cloud 9

https://static.wikia.nocookie.net/muppet/images/5/5a/BabyPiggysMermaidTale.jpg/revision/latest?cb=20190213204037 https://static.wikia.nocookie.net/muppet/images/4/4b/BabyFozzieOnCloudNine.jpg/revision/latest/scale-to-width-down/280?cb=20070304052212

Swim like mermaids do here on cloud 9. It talks about where swimming mermaids cloud 9.

Catalogue Number: 7608

Title Date: September 24, 1988

2 books "Baby Piggy's Mermaid Tale" and "Baby Fozzie On Cloud Nine".