There are also the 2 County CDs if you can find them [I think they have been deleted from the County catalogue]: 'Sand Mountain Blues' CCS-110 [1940s sides] and 'Brown's Ferry Blues' CCS-116 [mostly 1930s sides]. However, for the early stuff, you cannot go past the wonderful JSP box set with 4 CDs and 87 sides: The Delmore Brothers 'Classic Cuts 1933-41' JSP 7727. I have heard - but don't know if it is true - that JSP have plans for a further box set of later recordings.