Lyrics to Martha's original songs and reimiaginings of traditional songs can be found here:
The Ballad of Tregeagle, Part I
The Ballad of Tregeagle, Part II
More information about these songs can be found on Martha's Bandcamp Page. 'Cock in Britches', 'Delyow Sevi' and 'Estren' are well-known traditional Cornish songs, and you can find lyrics for these and more info at https://cornishnationalmusicarchive.co.uk/
'The Bonny Month of June' appears as 'Tansys Golowan' / 'Midsummer Feast' in Merv Davey's publication, 'Hengan'. More info here: https://cornishnationalmusicarchive.co.uk/content/hengan-traditional-folk-songs-dances-and-broadside-ballads-collected-in-cornwall/