1903/04=4,1; 1905/06=6,1; 1906/07=7,1; 1907/08=8,1; 1908/09=9,1; 1909/10=10,1; 1910/11=11,1; 1911/12=12,1; 1912/13=13,3; 1913/14=14,3; 1914/15=15,3; 1915/16=16,3; 1919/20=20,4; 1921/22=22,3; 1922/23=23,3; 1923/24=24,4; 1924/25=25,6; 1925/26=26,6; 1926/27=27,6; 1927/28=28,10; 1928/29=29,11 von: University of Colorado Boulder: University of Colorado bulletin
1913/14=68; 1914/15=80; 1915/16=93; 1919/20=153; 1921/22=180; 1922/23=192; 1923/24=205; 1924/25=219; 1925/26=231; 1926/27=243; 1927/28=259; 1928/29=272 von: University of Colorado Boulder: [University of Colorado bulletin / General series]
1913/14=16; 1914/15=18 von: University of Colorado Boulder: [University of Colorado bulletin / Catalogue series]