Authors: 1904
- Macy, Arthur 1842-1904
- Márquez, José Arnaldo 1830-1904
- Martin, George A. -1904
- Masefield, Judith 1904-
- Maurik, Justus van 1846-1904
- Mayson, Walter H. (Walter Henry) 1835-1904
- McLennan, William 1856-1904
- McMillan, D. G. (David Gervan) 1904-1951
- Miller, George Noyes 1845-1904
- Mission Chari-Lac Tchad (1902-1904) -
- Mitchell, J. Murray (John Murray) 1815-1904
- Molinier, Auguste 1851-1904
- Moore, Frank 1828-1904
- Morris, Richard B. (Richard Brandon) 1904-1989
- Morris, William O'Connor 1824-1904
- Mortimer, Lee 1904-1963
- Murray, W. H. H. (William Henry Harrison) 1840-1904
- Muybridge, Eadweard 1830-1904
- Nadaillac, Jean-François-Albert du Pouget, marquis de 1818-1904
- Nasmith, Joseph 1850-1904
- Novello, Sabilla -1904
- Öman, Victor Emanuel 1833-1904
- Omelka, František 1904-1960
- Panzacchi, Enrico 1840-1904
- Peek, Hedley 1858-1904
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