Hi, Jack. "Ryan's Mammoth" first appeared in 1883.

Howe's "1,000 Jigs and Reels" antedates the war, however, having appeared in 1860.

It would be interesting to analyze its sources. But since Howe was a publisher, not a tune collector, any "traditional fiddle tunes" not in earlier publications could only have come from Howe's acquaintances in the Boston area, even if some may have originated farther afield.