National Geologic Map Database
General Information
- Title: Letter to the Secretary; [Discussion of areal distribution of the lignitic formations]
- Author(s): Hayden, F.V.
- Publishing Organization: U.S. Geological and Geographical Survey of the Territories (Hayden)
- Series and Number: Monograph 7
- Larger Work: Lesquereux, Leo, Contributions to the fossil flora of the Western Territories; Part II, The Tertiary flora
- Publication Date: 1878
- Cross Section: None
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