Boulton, William Henry (1869- ) Michałowski, Kazimierz (1901-1981). Translator Michałowski, Kazimierz (1901-1981). Preface

Kerschensteiner, Georg Michael Anton (1854-1932) Tom, Alfred (1879-1944) Translator

Krzyszkowski, Wacław. Editor

Bradley, Harry Cyrus (1871-1936) Uhler, Eugene Henry (1884- )

Sokół, Franciszek (1890-1956)

Pierce, William Gamewell (1904-1994) Hunt, Charles Butler (1906-1997) United States of America. Geological Survey.

Larsen, Esper Signius (1879-1961) Berman, Harry (1902-1944) United States of America. Geological Survey.

Hendricks, Thomas Andrews (1907-1985) United States of America. Geological Survey.

Ray, James C. United States of America. Geological Survey.

Reed, John Calvin (1905-1993) United States of America. Geological Survey.

Buchwald, Eberhard (1886-1975) König, Hans

Capps, Stephen Reid (1881-1949) Moffit, Fred Howard (1874-1958?) United States of America. Geological Survey.

Wells, Francis Gerritt (1898-1969) Waters, Aaron Clement (1905-1991) United States of America. Geological Survey.

Tuck, Ralph (1904-?) United States of America. Geological Survey.

Mertie, John Beaver (1888-1980) United States of America. Geological Survey.

Lasky, Samuel G. (1901- ) United States of America. Geological Survey.

Moffit, Fred H. (1874-1958?) United States of America. Geological Survey.

Mertie, John Beaver (1888-1980) United States of America. Geological Survey.

Hewett, D. F. (1881-?) Callaghan, Eugene (1904-1990) Moore, B. N. Nolan, Thomas Brennan (1901-1992) Rubey, William Walden (1898-1974) Schaller, Waldemar Theodore (1882-1967) United States of America. Geological Survey.

Capps, Stephen Reid (1881-1949) Tuck, Ralph (1904-?) United States of America. Geological Survey.

Baker, Arthur Alan (1897-1996) United States of America. Geological Survey.