Roberto, I too have the Folkways FG 3509 album from 1961. It has a booklet with texts for all the ballads except 'The Brown Girl'! All he has for that is a note that Child published 8 texts and that his (MacColl's) version was learned from his mother in fragmentary form and collated with stanzas in Greig's 'Traditional Ballads and Ballad Airs'. Why don't you post what you have and others may be able to help you out - I am sure some 'Catters' have access to Greig which, unfortunately, I do not. That would be easier all round if you have much of it already written out.

--Stewie.