Clamshell is referred to the hard shell 8-track case that came in LearJet and Standard styles. Both showed artwork on the outside of the case. The inside of the Clamshell case had no felt type material.
Standard style case came after the LearJet case and did not have a transparent lid, but a lid that contained a label of the song list.
Tapes are closer to the original Master tapes. Release timeline: 1967 – 1968.
