Minerals of Colorado: a 100-year record /

Autor Eckel, Edwin Butt, 1906-1989
Vydáno 1961

Geology and mineral resources of Paraguay - a reconnaissance /

Autor Eckel, Edwin Butt, 1906-1989
Vydáno 1959

The Alaska earthquake March 27, 1964 : field investigations and reconstruction effort /

Autor Hansen, Wallace R., 1920-, Eckel, Edwin Butt, 1906-1989, Schaem, William E., Lyle, Robert E., George, Warren, Chance, Genie
Vydáno 1966