Replacing the crew of an observation ballon used on ships to detect mines

Title (Dublin Core): Replacing the crew of an observation ballon used on ships to detect mines
Subject (Dublin Core): en Technology; en Ships; en Reconnaisance
Article Title and/or Image Caption (Dublin Core): Dropping the Pilot - 1919 Version
Contributor (Dublin Core): International Film Service (image copyright))
Language (Dublin Core): eng
Temporal Coverage (Dublin Core): Interwar period
Date Issued (Dublin Core): 1919-06
Is Part Of (Dublin Core): Popular Science Monthly, v. 94, n. 6, 1919
pages (Bibliographic Ontology): 26
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