Arthur and Julius had teamed up with Toei Animation on such classics as the claymated "Rudolph the red Nosed Reindeer" series, two Frosty the Snowman cartoons and in 1978 the first of two JR Tolkin Hobbit animations.
The Last Unicorn is probably the best known of the Rakin's list of works and was the creative spark for Ghibli Studios which was born from the Topcraft animation collective of anime artists who worked with the Rankins.
Oh those fond memories. Thanks Arthur.