For "Seventeen come Sunday" search DT for [Laws] O17, and also look in the Traditional Ballad Index on the web. No song "My Bonny Boy" is listed in Margaret Dean Smith's 'A Guide to English Folk Song Collections'. It's possibly "The bonny boy" a traditional song from a late 18th or early 19th century broadside, that was a recasting of the 17th century "Cupid's Trappan". 'Folk Songs from Somerset', is the title of the 1st two issues of Novello's 'Songs for Schools', and another book, all by Cecil Sharp. ["Bonny boy" might also be that called "Daily Growing" in DT. I got the earliest text of this, 1824, just yesterday.]