Bretton Woods-Mount Washington Golf Course:
This course is listed as a 1915 design, but the work wasn’t completed until later and the course was opened in 1921. Here are a few articles detailing some of Ross’ work at Mount Washington and announcing the opening.
In the Tufts Archives there are drawings for all 18 holes of the “Bretton Woods” course. The drawings match up with what the first article is telling us. Ross built an entirely new nine (the back nine) and altered many of the original holes on the front, but did retain the first hole and some of the features and routing of Holes 13-16 for his 4th through 7th holes.
The original Mount Pleasant nine was broken off in 1921 and called the Mount Pleasant course again, making 27 holes in total.
The White Mountain Echo., September 04, 1920:
Announcement of the opening match on August 21, 1921: