John Clifford, in his introduction, lists his main sources thus:

Collection of Original Lancashire Hornpipes ed. by Thomas Marsden, pub. by John Playford in 1705.

Third Book of the most celebrated jigs, Lancashire hornpipes, Scotch and Highland lilts, Northern Frisks, morriss's Cheshire rounds and hornpipes the bagpipe manner. To which is added the Black Joak, the White Joak, the Brown, the Read, and the Yellow Joaks. With a variety of Whims and Fancies of diff'rent humours fitted to the genious and use of Publis Performers. ed. anon, pub. by John Walsh, c. 1730.

An Extraordinary Collection of pleasant and merry humours, never before published, containing Hornpipes, Jiggs, North Cuntry Frisks, Morris's, Bagpipe, Hornpipes & Rounds, with severall Additional fancies added, fit for all those who play Public, pub. by Daniel Wright, c. 1715.

The Dancing Master, pub. by John Playford, after 1690 by Henry Playford and after 106 by John Young.

There would seem to be the potential for repetition but, as one of the main tenets of my life is "you can't have too many books", I'd say get it anyway!

Hope this helps.

Harry