• 7 Jen do studovny

• 7 Kniha

Externí sklad

• 7 Schumacher, Earle E.
• 4 Bell Telephone Laboratories
• 2 American Institute of Mining and Metallurgical Engineers
• 2 Ellis, W. C.
• 2 Ferguson, Lawrence
• 1 American Telephone and Telegraph Company
• 1 Basch, Edward J.
• 1 Bouton, George M
• 1 Bouton, George M.
• 1 Eckel, John F.
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• 7 angličtina