The microphones and geophones, used to locate German mines during war, could be used to save miners trapped underground

Title (Dublin Core): The microphones and geophones, used to locate German mines during war, could be used to save miners trapped underground
Subject (Dublin Core): en Technology; en Explosives and land mines; en Other
Article Title and/or Image Caption (Dublin Core): Trapped in the Bowels of the Earth
Language (Dublin Core): eng
Temporal Coverage (Dublin Core): Interwar period
Date Issued (Dublin Core): 1919-05
Is Part Of (Dublin Core): Popular Science Monthly, v. 94, n. 5, 1919
pages (Bibliographic Ontology): 67
Rights (Dublin Core): Public domain (Google digitized)
Source (Dublin Core): Google Books
Archived by (Dublin Core): Davide Donà; Marco Bortolami (editor)
Spatial Coverage (Dublin Core): United States of America