I don't know what that is supposed to mean.

John Moulden listed references in the Roud Folk Song Index earlier in this discussion (nearly nine years ago); the Index is now available online, so interested people can consult it directly for themselves via the website of the Vaughan Williams Memorial Library at  http://library.efdss.org/:

Roud Folk Song Index

'Peggy Gordon' is assigned Roud Number 2280, though one reference has inadvertently been inserted under number 2180 (a typo which will be corrected). 'Sweet Peggy Gordon' is listed, but without a number assigned because the text has not yet been checked.

Other useful online catalogue listings:

Sweet Peggy Gordon / Mort Montonyea [sound recording]   - American Folklife Center: Traditional Music and Spoken Word Catalog entry.

Peggy Gordon   - instances in the Helen Creighton Collection, Nova Scotia Archives.