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1.
Correlation of the Big Blue series in Nebraska, by G. E. Condra and J. E. Upp. by Series: Nebraska. Geological survey. Bulletin 6, second ser
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: [Lincoln] Printed by authority of the state of Nebraska, 1931
Availability: No items available.

2.
The Middle River traverse of Iowa, by G. E. Condra and J. E. Upp. by
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: [Lincoln] Printed by authority of the state of Nebraska, 1933
Availability: No items available.

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