Titlebook: Across the Sahara; Tracks, Trade and Cr Klaus Braun,Jacqueline Passon Book‘‘‘‘‘‘‘‘ 2020 The Editor(s) (if applicable) and The Author(s) 202

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https://doi.org/10.1007/3-540-29949-1For a long time, knowledge about the structure and appearance of the newly claimed lands brought political, economic and strategic advantages. Geographic knowledge meant power. For this reason, maps were also a well-kept secret.

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Book‘‘‘‘‘‘‘‘ 2020The book aims to be a useful reference for the caravan trade in the Sahara, that can be recommended both to students and to specialists and researchers in the field of Geography, History and African Studies..

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Front Matterlybdenum, and to compare and contrast with previous observations on copper and nickel. The defect structures produced by neutron irradiation at doses up to approx. 10.., at temperatures from ambient to 600°C, are being studied using transmission electron microscopy. For low doses approx. 10.. at 600

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Traders, Nomades and Slaves, possibility of melting and solidifying materials without physical contact. This “containerless processing” eliminates contaminants that may be introduced by the container or crucible and may be used to obtain ultrapure materials. This is especially important for systems that are highly corrosive in

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,Places of Trade, Communication and Religion—Important Oases,d upon the author‘s experience as head of the Materials Science Department of the In- stitut fUr Umformtechnik at the University of Stuttgart. The book deals with materials testing for the special demands of the metal for- ming industry. The general methods of materials testing, as far as they are n