Oum den vita delfinen: Grottan under vattnet [Williams maxialbum]

A single-issue Swedish comic from 1973 published by Williams Förlags AB, this entry in the Williams maxialbum line follows the adventures of Oum, the white dolphin, as she explores an underwater cave. The story is a standalone aquatic tale, part of a series of oversized albums that brought European adventure comics to Swedish readers. While brief, it represents a niche moment in 1970s Swedish comics publishing.