Here's the ASGCA list for 1897 and 1898. By my count that is only 40 courses.
Bellerive Country Club (St. Louis Field Club) St. Louis, Missouri 1897
Chappaqua Golf Club Chappaqua, New York 1897
Chestnut Hill Golf Course Montclair, New Jersey 1897
Dyker Beach Golf Course (Marine and Field Golf Course) Brooklyn, New York 1897
Forest Hills Field Club Newark, New Jersey 1897
Hendricks Field Golf Course Belleville, New Jersey 1897
Morris County Country Club Morristown, New Jersey 1897
Mount Pleasant Field Club Sing Sing, New York 1897
Nyack Country Club Nyack, New York 1897
Oswego Golf Club Oswego, New York 1897
Roselle Casino Golf Course Roselle, New Jersey 1897
Tuscumbia Country Club Green Lake, Wisconsin 1897
Yahnundasis Golf Course New Hartford, New York 1897
Bernardsville Golf Club Bernardsville, New Jersey 1898
Century Country Club The Bronx, New York 1898
Columbia Golf and Country Club Chevy Chase, Maryland 1898
East Orange Golf Club Short Hills, New Jersey 1898
Eastern Point Golf Club Groton, Connecticut 1898
Eastern Point Golf Club Newport, Rhode Island 1898
Essex County Country Club (East Course) West Orange, New Jersey 1898
Golf Club of Lakewood Lakewood, New Jersey 1898
Hillside Golf and Tennis Club Plainfield, New Jersey 1898
Hilmetia Golf Club Hilmetia, New Jersey 1898
Lawrence Harbor Country Club Morgan, New Jersey 1898
Littlefield Golf Club Littlefield, Connecticut 1898
Mohawk Golf Club Schenectady, New York 1898
Montclair Golf Course West Orange, New Jersey 1898
Nutley Golf Club Nutley, New Jersey 1898
Park Golf Club North Plainfield, New Jersey 1898
Pelham Manor Golf Course Westchester, New York 1898
Plainfield Golf Club, West Course Edison, New Jersey 1898
Private Course for Mr. Stittson, Tuxedo Park Estate Sturlington, New York 1898
Rockaway Hunting Club Cedarhurst Long Island, New York 1898
Saginaw Country Club Saginaw, Michigan 1898
South Wilton Golf Club South Wilton, Connecticut 1898
Stonehenge Golf Club Norwalk, Connecticut 1898
Washington Golf Club Washington, Connecticut 1898
Waveland Golf Course Chicago, Illinois 1898
Williamsport Country Club Williamsport, Pennsylvania 1898
In other news, it turns out Bendelow laid out the original 18 hole course at Happy Hollow in 1907. The ASGCA listing gives a date of 1925, which might coincide with his addition of a new 9 holes.