Mader, Felix (1867-1941) Lösti, Georg (1859-1943). Photographer Heuwieser, Max (1878-1944). Preface
Hess von Wichdorff, Hans (1877-1932) Königlich Preussische Geologische Landesanstalt
Schliepmann, Hans (1855-1929). Editor
Deutsche Landwirtschafts-Gesellschaft
Heald, Kenneth Conrad (1888-1971) United States of America. Geological Survey.
Ross, Clarence Samuel (1880-1975) United States of America. Geological Survey.
Heald, Kenneth Conrad (1888-1971) Bowen, Charles F. (1871-1953) United States of America. Geological Survey.
Ross, Clarence Samuel (1880-1975) United States of America. Geological Survey.
Heald, Kenneth Conrad (1888-1971) Mather, Kirtley Fletcher (1888-1978) United States of America. Geological Survey.
Robinson, Heath Montgomery Mills, Ronald Van Auken (1881-?) United States of America. Geological Survey.
Heald, Kenneth Conrad (1888-1971) Mather, Kirtley Fletcher (1888-1978) United States of America. Geological Survey.
Bowen, Charles F. (1871-1953) Roundy, Paul Vere (1884-1937) Ross, Clarence Samuel (1880-1975) Reeves, Frank (1886-1986) United States of America. Geological Survey.
Robinson, Heath Montgomery Mills, Ronald Van Auken (1881-?) United States of America. Geological Survey.
Capps, Stephen Reid (1881-1949) United States of America. Geological Survey.
Shaw, Eugene Wesley (1881-1935) Kirtley, F. Mather (1888-1978) United States of America. Geological Survey.
Martin, George Curtis (1875-1943) United States of America. Geological Survey.
Grout, Frank Fitch (1880-1958) Soper, Edgar Kirke (1886-?) United States of America. Geological Survey.
Gurlitt, Cornelius (1850-1938). Editor
Hopkins, Oliver Baker Powers, Sidney (1890-1932) United States of America. Geological Survey.
Zarzecki, Lucjan (1873-1925)