Both my copies are ex-library but I can't find an ISBN anywhere. They are published by OUP 1974 so I doubt you'd get permission to publish them online.

The 2 Cecil Sharp books originally mentioned may be out of copyright as they were published around 1920. They were very expensive and very nicely bound. The last time I saw a set of these they were in a sale from the Hudleston collection at Tenants, Leyburn, and they went for some ridiculous figure.