Playfair grid Dublin Core Title Playfair grid Creator Canada Declassified Collection CDWI (Wireless Interception) Citation Canada Declassified, “Playfair grid,” Canada Declassified, accessed April 12, 2026, https://declassified.library.utoronto.ca/items/show/223610. Output Formats atom csv dcmes-xml json omeka-xml ← Previous Item Next Item →