Guestwho wrote: "I have just been lent a CD copy of "The Rout Of The Blues" released on Leader Records in 2001, LERCD2011. So it is out there!"
My understanding of the CDs of the Trailer stuff that does circulate is that they were CD-Rs made and sold by Celtic Music from vinyl transcriptions. Often seen on eBay. It was quote a few years ago, as well - audio transcription software has improved heaps since then - about time someone did a proper job (assuming here that the master tapes are missing or out of reach).