Issue Date

• 1891 (1) + -
• 1900 (1) + -
• 1912 (1) + -
• 1915 (1) + -
• 1938 (1) + -
• 1938-11 (1) + -
• 1940 (1) + -
• 1943 (2) + -
• 1944 (1) + -
• 1945 (1) + -

• 1951 (1) + -
• 1952 (1) + -
• 1954 (2) + -
• 1955 (1) + -
• 1956 (2) + -
• 1961 (1) + -
• 1965 (1) + -
• 1967 (2) + -
• 9999 (2) + -
• 9999 /> (2) + -

Topic

• Caves (1) + -
• Clay (1) + -
• Clay -- Testing (1) + -
• Coal (2) + -
• Fire-clay (1) + -
• Geology (13) + -
• Geology, Stratigraphic (3) + -
• Groundwater (1) + -
• Invertebrates, Fossil (1) + -
• Mines and mineral resources (4) + -

• Natural gas (1) + -
• Ordovician Geologic Period (1) + -
• Paleontology (1) + -
• Pennsylvanian Geologic Period (1) + -
• Petroleum (1) + -
• Physical geography (1) + -
• Propaganda, German (1) + -
• Pyrites (1) + -
• Springs (1) + -
• Stream measurements (1) + -
• Water-supply (1) + -
• World War, 1914-1918 -- Food supply -- Great Britain (1) + -
• World War, 1914-1918 -- Great Britain (1) + -
• World War, 1914-1918 -- Propaganda (1) + -
• World War, 1914-1918 -- Rationing (1) + -
• World War, 1914-1918 -- United States (1) + -

Geographic Area

• Missouri (16) + -
• Missouri -- Boone County (1) + -
• Missouri -- Crawford County (1) + -
• Missouri -- Dent County (1) + -
• Missouri -- Hickory County (1) + -
• Missouri -- Saint Clair County (1) + -
• Missouri -- Steelville Region (1) + -
• United States -- Mississippi Embayment (1) + -
• United States -- Ozark Mountains (2) + -

Time Period

• 1890-1899 (1) + -
• 1900-1909 (1) + -
• From 280 to 310 million years ago (1) + -
• From 425 to 500 million years ago (1) + -