Joe, apart from the title of the entry, boldface indicates recordings.

"PK" is Peter Kennedy. The virgules separate recordings - confusingly to my eye.

After the quoted opening line of the song comes the Roud Number (if any), which refers to Steve Roud's comprehensive index of English-language folk music titles. In this case, "HUGHES ICS 2 1914 p1 3v Co Tyrone" means that Herbert Hughes's "Irish Country Songs" (1914) prints a version from County Tyrone on p. 1 of Volume 2, and that the whole work consists of 3 volumes. The FTX link is to the Folktrax CD that contains a version.

In other words, it helps a lot to be familiar with the field! The catalogue undoubtedly started in the form of Kennedy's jotted bibliographic notes to himself!

The information on recordings is far clearer - I think. The FTX link is to the Folktrax CD that contains a version.