Ritchie -
If you look at folkinfo's abc which includes the song (X:102), the source seems to be one of Helen Creighton's recordings. The relevant headers are:
T:Captain Wedderburn's Courtship
B:Journal of the English Folk Dance and Song Society, Dec 1951
F:http://www.folkinfo.org/songs
S:Tom Young, Nova Scotia, July 23, 1937
Z:Doreen H Senior and Helen Creighton
ie Source is Tom Young, transcribed by Senior and Creighton.
JEFDSS, Dec 3, 1951 does include an article by Senior and Creighton: Folk Songs Collected In The Province of Nova Scotia, Canada, which I presume is the source. This document The Creighton-Senior Collaboration (pdf) has an account of the trip and the collection of the song (p23, para 3).
Mick