I'm watching the TV special called "Casper's First Christmas". This was from 1979 (I was a year old back then). Casper was the only Harveytoon star in that special along with a bunch of Hanna-Barbera characters like Yogi Bear, Snagglepuss, Quick Draw McGraw, Huckleberry Hound and others. I looked up on IMDb on the company credits sections that says "Hanna-Barbera Productions" and distributed by the same name and it doesn't say Harvey Entertainment Company. Harvey is the company that bought the classic Harveytoon characters like Casper, Little Audrey, Herman & Katnip and Baby Huey. The special I think was kinda weird because Hanna-Barbera and Harvey aren't together. Casper was the only one in the H-B special, the rest of the Harveytoons doesn't belong to H-B.