WANTED: PUZZLE RECORDS

I am looking for all forms of puzzle records and any related information regarding their manufacture. By definition, a puzzle record has multiple songs or other recordings hidden in concentric tracks on 10 or 12 inch 78 rpm records. You can't identify them by looking at the record. The only clue may be on the labels themselves, which might say puzzle record or have multiple titles listed on the same side, but not necessarily...

I am particularly looking for an HMV or other label, Limerick record. It has the start to a limerick and various different endings... depending on where you place the needle. Any information on when, how or where these type of records were made, would be appreciated.
Curt (Vinyl Visions on the board)
email: puzzlerecords(at)outlook(dot)com