What has been collected, and what do the catalogues refuse to say about it?

Every value here is graded at E2 or below. E2 means Common Tape observed the listing in a sanctioned catalogue on a known date — it attests that the listing exists, never that the product works. E1 is the publisher’s own declaration. A dash is a recorded absence, not a zero. Nothing on this page has been verified by a third party, because no source in the index publishes third-party verification.