This is what I have for Fenn in my files. There are probably more out there, be great to see any new information.
Going forward, it might make sense to add this kinds of new information to any existing threads. Saves some bandwidth and keeps all of the relevant information in the same place and more accessible for anyone looking into it.
Waterbury Golf Association, Waterbury, CT (1895)
Poland Spring GC, Poland Spring, ME (1896, 1916)
Allston GC, Allston, MA (1896)
Portsmouth Naval Yard GC, Portsmouth, NH (1896)
Bristol GC, Bristol, RI (1896)
CC of Farmington, Farmington, CT (1896)
Woodland CC, Newton, MA (1896)
Oquossoc GC, Rangeley, ME (1899)
Fall River CC, Fall River, MA (1899)
Profile GC, Franconia, NH (1899)
Crawford House Links, White Mountains, NH (1899) - Also attributed to Findlay.
Twin Mountain House Links, White Mountains, NH (1899)
Fabyan House GC, White Mountains, NH (1899) - also attributed to Findlay.
Mount Washington GC oka Bretton Woods GC, Bretton Woods, NH (1899)
Bryn Mawr GC, Bryn Mawr, PA (1899)
Waumbeck GC, Jefferson, NH (1899)
Palm Beach GC aka The Breakers, Palm Beach, FL (Pre-1900 and 1909)
Waumbeck GC, Jefferson, NH (1899)
Abenaqui CC, Rye Beach, NH (unk) - Harper's attributes this course to Alex Findlay in 1899
Palmetto GC, Aiken, SC (unk) - it has been proposed that Fenn did some work on the original course