Here's the list I've come up with for the 1900-09 period. Again, I'd appreciate any thoughts on additions to the lists, corrections to information noted or further information on other architects that may have participated in the design process
Flossmoor Country Club (1900) Herbert J. Tweedie; Tweedie, H.W. Gentles, James S. Pearson (1901); Harry Collis (1918); Ray Hearn (2009) - [Course known as Homewood Country Club until 1911]
Glen Echo Country Club (1901) Jim Foulis
Country Club of Buffalo (Grover Cleveland) (1902) Unknown; Walter J. Travis (1911)
Inverness Club (1903) Unknown; Donald Ross (1915); A.W. Tillinghast (??); Dick Wilson (??); George Fazio, Tom Fazio (1978); Arthur Hills (1999)
Inwood Country Club (1903) Wiliam Exton, Arthur Thatcher; Herbert Strong (1911); Hal Purdy (1959); Francis Duane (1972); Tom Doak (1998)
Oakmont Country Club (1903) Henry Fownes
Pinehurst Resort No. 2 (1903) Donald Ross; Bill Coore, Ben Crenshaw (2010)
Wykagyl Country Club (1904) Lawrence Van Etten; Donald Ross (??); A.W. Tillinghast (??); Arthur Hills (1994); Bill Coore, Ben Crenshaw (??)
Minkahda Club (1907) Donald Ross, Willie Watson (1917)
Beverly Country Club (1908) George ONeil, George Janes, John A. Middleton; Donald Ross (1918); Bob Lohmann (1985); Ron Prichard (2002)
Seattle Golf Club (1908) John Bell, Robert Johnstone