The Leader sound discography in Musical Traditions has a number catalogue entries for LPs which were never issued. They are listed below, and my apologies for not being able to include the lettered prefixes or the pricing codes, since these are not shown for unreleased material in MT's listing. Presumably, it was the vinyl shortage of 1973 which caused Leader's demise and prevented these LPs from seeing the light of day.
One of these numbers, I am almost sure, was earmarked for an LP of Elizabeth Cronin, although I do not know which one. Would there be anyone out there who could provide any discographical details? Many hopeful thanks.