Authors: P
- Lubbock, Percy 1879-1965
- Lucas, Charles Prestwood, Sir 1853-1931
- Lucini, Gian Pietro 1867-1914
- Luís I, Rei de Portugal 1838-1889
- Lybbe, Philip Lybbe Powys -
- Lydia E. Pinkham Medicine Company -
- Lyford, Philip 1887-1950
- Lyle, Eugene P. (Eugene Percy) 1873-1961
- Macclesfield, George Parker, Earl of -1764
- MacClintock, Porter Lander 1873-1939
- MacDonald, John D. (John Dann) 1916-1986
- MacDonald, Philip 1900-1980
- MacDonald, Pirie 1867-1942
- MacEwan, Peter 1856-1917
- MacFarlane, Peter Clark 1871-1924
- MacGill, Patrick 1889-1963
- MacGoun, H. C. Preston (Hannah C. Preston) 1864-1913
- Mackarness, Henry S., Mrs. 1826-1881
- MacKaye, Percy 1875-1956
- MacKendrick, Paul Lachlan 1914-1998
- Mackie, Pauline Bradford 1873-1956
- MacLean, J. P. (John Patterson) 1848-1939
- Macmahon, Joseph Parkyns -
- Macmillan & Co. -
- Macnab, P. (Peter) -1900
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