Secrets of the code and statecraft

Title (Dublin Core): Secrets of the code and statecraft
Subject (Dublin Core): en Technology; en Communication
Article Title and/or Image Caption (Dublin Core): Title: Secrets of the code and statecraft; Title: Master spies
Contributor (Dublin Core): Thomas M. Johnson (writer)
Language (Dublin Core): eng
Temporal Coverage (Dublin Core): World War I
Date Issued (Dublin Core): 1932-04
Is Part Of (Dublin Core): Popular Mechanics, v. 57, n. 4, 1932
pages (Bibliographic Ontology): 636-640
Rights (Dublin Core): Public domain
Source (Dublin Core): Google Books
References (Dublin Core): zeppelin; John J. Pershing; Magdeburg-class cruiser; von Bernstorff
Archived by (Dublin Core): Alessandro Barcaro; Marco Bortolami (editor)
Spatial Coverage (Dublin Core): Europe