What Bee Gees album contains the song South Dakota Morning?

The song "South Dakota Morning" is featured on the Bee Gees' album titled "Cucumber Castle," which was released in 1970. This album showcases the group's transition from their earlier pop sound to a more diverse musical style. "Cucumber Castle" includes a blend of ballads and upbeat tracks, highlighting the Bee Gees' vocal harmonies and songwriting skills.