scientific article published in 1914

scientific article published in 1914

scientific article published in 1918

scientific article published in 1915

scientific article published in 1917

Washington, Govt. Print. Off., 1914.

scientific article

article published in 1914

scientific article published in 1919

scientific article published in 1914

scientific article published in 1920

scientific article

scientific article published in 1911

scientific article published in 1918

scientific article