Border Line (Switzerland) (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Border Line (Switzerland)" in English language version.

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festung.ch

"Geschichte der Festung Heldsberg" (in German). Festungsmuseum Heldsberg. Retrieved 13 January 2011.
"Die Sperre am Stoss" (in German). Festungsmuseum Heldsberg. Retrieved 13 January 2011.
"Festungen nach dem zweiten Weltkrieg" (in German). Festungsmuseum Heldsberg. Retrieved 13 January 2011.

Holford, Paul. "Fort du Pré-Giroud". Casemate (82). Fortress Study Group. Retrieved 11 January 2011.

"Lageplan" (in German). Schweizerisches Militämuseum Full. Archived from the original on 7 July 2011. Retrieved 12 January 2011.

"Bienvenue". Pré-Giroud Fort 39-45 (in French). Fondation du Fort de Vallorbe (Pré-Giroud). Archived from the original on 9 December 2010. Retrieved 11 January 2011.

"Die Festung Ebersberg" (in German). Bunkeranlagen der Schweiz. Archived from the original on 4 February 2011. Retrieved 13 January 2011.

"Die Festung Ebersberg" (in German). Bunkeranlagen der Schweiz. Archived from the original on 4 February 2011. Retrieved 13 January 2011.
"Bienvenue". Pré-Giroud Fort 39-45 (in French). Fondation du Fort de Vallorbe (Pré-Giroud). Archived from the original on 9 December 2010. Retrieved 11 January 2011.
"Lageplan" (in German). Schweizerisches Militämuseum Full. Archived from the original on 7 July 2011. Retrieved 12 January 2011.
"Artillery Fortress Ebersberg (A5438)". STIWOT. Archived from the original on 18 July 2011. Retrieved 13 January 2011.

"Artillery Fortress Ebersberg (A5438)". STIWOT. Archived from the original on 18 July 2011. Retrieved 13 January 2011.