Authors: 1950
- Howes, Ethel Puffer 1872-1950
- Hughes, Edwin Holt 1866-1950
- Hutt, Henry 1875-1950
- Ingram, Rex 1892-1950
- Jackson, John Edwin 1876-1950
- Jaques-Dalcroze, Émile 1865-1950
- Jaschik, Álmos 1885-1950
- Jean-Aubry, G. (Georges) 1882-1950
- Jensen, Johannes V. (Johannes Vilhelm) 1873-1950
- Karlin, Alma M. 1889-1950
- Kellett, E. E. (Ernest Edward) 1864-1950
- Kennedy, Charles Rann 1871-1950
- Kerlin, Robert Thomas 1866-1950
- Ketcham, Orman Wesley 1865-1950
- Kilian, Conrad 1898-1950
- King, William Lyon Mackenzie 1874-1950
- Kippenberg, Anton 1874-1950
- Kirkpatrick, R. (Randolph) 1863-1950
- Kneeland, Clarissa A. (Clarissa Abia) 1878-1950
- Knipe, Alden Arthur 1870-1950
- Korzybski, Alfred 1879-1950
- Larguier, Léo 1878-1950
- Laski, Harold J. (Harold Joseph) 1893-1950
- Lauder, Harry, Sir 1870-1950
- Lawrence, Edwin Gordon 1859-1950
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