Periscopes Hidden in Mirrors Protected German "Subs"

Title (Dublin Core): Periscopes Hidden in Mirrors Protected German "Subs"
Subject (Dublin Core): en Technology; en Airplanes and Zeppelins
Article Title and/or Image Caption (Dublin Core): Periscopes Hidden in Mirrors Protected German "Subs"
Language (Dublin Core): eng
Temporal Coverage (Dublin Core): interwar period
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 (Google digitized)
Source (Dublin Core): Google Books
Archived by (Dublin Core): Alberto Bordignon