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                     Maduro, , USA
                     Mae, Vanessa, London
                      Manklang, Prajuab, Bangkok
                     Mann, W. L., USA
                     Manning, , USA
                     Marchington, C., USA
                     Marre B., Marco,
                     Martens 1806-1885, Friedrich von,
                     Marti, Stephan, Langenthal
                     Mathis, Peter,
                     McCulloch, James, USA
                     McDonald, Sandra, Geneva
                     McKay, , USA
                     Meares 1756-1809, John,
                     Melan, A., Switzerland
                     Miles Brothers, , USA
                     Miller Photo, , USA
                     Miltenberger, Brigitte, Buergstadt
                     Miltenberger, Brigitte, Germany
                     Mining Oil Bulletin, , USA
                     Moellhausen 1825-1905, Heinrich Balduin, Germany
                     Moellinger 1817-1880, Franziska, Switzerland
                     Moergeli, Andre C., Switzerland
                     Moffett Studio, , USA
                     Morini, Carlo A., Ottenbach
                     Motonobu, Kano, Japan
                     Mueller, Frederick W., USA
                     Mueller, Meinrad, Switzerland
                     Munkle, , USA
                     Munz, Roland, Switzerland
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         Unknown