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Bulletin, Issues 409-414. This compilation presents early 20th‑century geoscience and surveying outputs issued by the U.S. Government, including a technical catalog from a nationwide spirit leveling project in Ohio (1898–1908) detailing a statewide vertical control network used to establish elevations. The data are organized by quadrangle and local landmarks, noting benchmark types, marker inscriptions, elevations, and the personnel responsible for leveling work, with references to primary traverse lines and marker restorations. The volume also contains a 1909 bibliography indexing North American geology literature for 1908, with author‑indexed entries and brief descriptive notes. A separate Alaska report documents the Innoko‑Kuskokwim placer district (1908–1910), describing geology, mineral resources, transport routes, and mining history, while another Nevada/Humboldt County section surveys mining districts and ore occurrences with historical context. Together, these parts illustrate early 20th‑century geodetic practice, regional geology, and resource development across North America.

Encadernação Bulletin, Issues 409-414 (English Edition):Kindle
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