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Geology, Stratigraphic. --- Submarine topography --- Ocean bottom --- Geology

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Hydrographic surveying. --- Submarine topography. --- United States.

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This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact

Science: general issues --- Physical geography & topography --- Core --- stratification --- Convection --- magnetic field --- Planets

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Coral reefs and islands --- Submarine topography --- Underwater cameras. --- Image processing --- Remote sensing. --- Equipment and supplies. --- Digital techniques.

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In Athens, most remains of the ancient city-wall were revealed during rescue excavations; as a result, documentation is scattered and fragmented. This book systematically investigates all published data, revealing the history and the nature of the surviving remains of this significant monument. The book provides an analysis of the ancient literary sources, the western travellers' accounts, and the history of archaeological research on the circuit walls of ancient Athens. It collects, records, and maps all archaeological data from systematic and rescue excavations of the physical remains of the wall as it evolved over eleven centuries and through more than a dozen construction phases. It reviews issues relating to structure, chronology and topography of the ancient city wall, as well as to the management of its remains by the state authorities. The enormous amount of primary evidence makes the book essential reading for scholars of the topography of ancient Athens. This monograph also aspires to increase community awareness of cultural heritage in everyday urban contexts, as the wall has been preserved in a number of ways: in basements of buildings, reburied in situ, in the open air or beneath glass floors.

City walls --- Fortification --- Excavations (Archaeology) --- Fortification, Primitive --- Forts --- Military engineering --- Siege warfare --- Village walls --- Walls --- History --- Athens (Greece) --- Antiquities. --- Defense. --- Excavations. --- Preservation. --- Topography.