Book  (Apr 1993)  Page(s) 467.  
 
President Coolidge Large-flowered Climber, glowing crimson, 1925, (R. setigera x R. wichuraiana) x 'Chateau de Clos Vougeot'; Horvath. Description.

Book  (1936)  Page(s) 171.  
 
Coolidge, President (hybrid setigera) Horvath 1925; R. setigera X R. Wich. X Ch. Clos Vougeot; glowing crimson, very double, form of Vougeot, floriferous, growth 8/10, climbing, very hardy. Sangerhausen

Book  (1926)  Page(s) 185.  
 
President Coolidge Hybrid setigera (M.H. Horvath, 1925.) (R. setigera x R. wicuraiana) x "Chateau de Clos Vougeot'... glowing crimson, similar to 'Chateau de Clos Vougeot'... a strong climbing plant of extreme hardiness...