article published in 1922

scientific article published in November 1917

Stanford University, Calif.: The University, 1919.

scholarly article by G. F. Ferris published in April 1918

scientific article published in 1922

scientific article published in 1937

scientific article published in April 1921

scientific article published in November 1922

scientific article published in September 1925

scientific article published in March 1920

scientific article published in July 1918

article

article published in 1916

scientific article published in 1934

scientific article published in October 1927

Stanford University: The University, 1920.

Stanford University, Cal., The University, 1915.

Stanford University, Cal., The University, 1918.

article published in 1920

scientific article published in 1956