It is in these songbooks (info from Plymouth Song Index).

"The Lass with the delicate air":
Music of all nations, ed. h.j. wood, vol.1                   Songbook
New guitar songbook                               1985       Songbook
Busker's fake book, 1001 all-time hit songs       1993       Songbook
Francis and day's community song book, vol.8                  Songbook

"The lass with the delicate air" (in G):
Selected songs                                     1975       Songbook

~Masato