O scale (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "O scale" in English language version.

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gauge0guild.com

Ian Middleditch. "What is 0 Gauge?". Gauge '0' Guild. Archived from the original on 2010-01-11. Retrieved 2010-04-11.

"Normes Européennes de Modélisme: Rapports de réduction, échelles, écartements" (PDF) (in French). Union Européenne des Modélistes Ferroviaires et des Amis des Chemins de Fer. 2004. Retrieved 2010-04-11.

Ian Middleditch. "What is 0 Gauge?". Gauge '0' Guild. Archived from the original on 2010-01-11. Retrieved 2010-04-11.
"NMRA STANDARDS S-1.2 Standards for Scale Models" (PDF). National Model Railroad Association. July 2009. Archived from the original (PDF) on 2010-07-06. Retrieved 2010-04-11.
T.J. Klevar (2008-02-17). "Standards & Recommended Practices - Introduction". National Model Railroad Association. Archived from the original on 2010-04-03. Retrieved 2010-04-11.