Periscopes hidden in mirrors protected german "subs"

Title (Dublin Core): Periscopes hidden in mirrors protected german "subs"
Subject (Dublin Core): en Technology; en Submarines
Article Title and/or Image Caption (Dublin Core): Periscopes hidden in mirrors protected german "subs"
Language (Dublin Core): eng
Temporal Coverage (Dublin Core): World War I
Date Issued (Dublin Core): 1930-07
Is Part Of (Dublin Core): Popular Mechanics, v. 54, n. 1, 1930
pages (Bibliographic Ontology): 72
Rights (Dublin Core): Public domain
Source (Dublin Core): Google Books
References (Dublin Core): zeppelin
Archived by (Dublin Core): Alessandro Barcaro; Marco Bortolami (editor)