Here's a list of Clark projects:
Omaha Field Club (Omaha, NE) - Added 3 holes, 1913
Minneapolis GC w/Willie Park (Minneapolis, MN) - 18 holes, 1916
Columbia Park Municipal GC (Minneapolis, MN) - 9 holes, 1919
Glenwood Park Municipal GC (Minneapolis, MN - Added 9 holes, 1919
Oak Ridge GC (Minneapolis, MN) - 9 holes, 1921
Columbia Park Municipal GC (Minneapolis, MN) - Revised 9 holes, Added 9 holes, 1922
Francis A. Gross GC aka Armour Park Municipal GC (Minneapolis, MN) - 18 holes, 1925
Mount Plymouth CC - St. Andrews Course (Orlando, FL) - 18 holes, 1925
Palatka Municipal GC (Palatka, FL) - 18 holes 1925
Lake Avalon CC (Winter Garden, FL) - 18 holes, 1926
Plant City G&CC (Plant City, FL) - 9 holes, 1926
Palisade GC (Clermont, FL) - 18 holes, 1927
Jacksonville Beach CC (Jacksonville Beach, FL) - 9 holes, 1928
I've also seen his name attached to Meadowbrook GC aka Southwest GC in Minneapolis, which other sources have as a Foulis.