Tunnels: Revision history

18 July 2023

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11 July 2023

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14 December 2022

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18 November 2022

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16 September 2022

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• curprev 06:0106:01, 16 September 2022‎ Grichards talk contribs‎ 1,299 bytes +1,299‎ Created page with "<!-- Delete any sections that are not necessary to your topic. Add pictures/sections as needed --> __NOTOC__ ---- <!-- Introductory paragraph or topic page summary --> A long underground excavation with two or more openings to the surface, usually having a uniform cross section used for access, conveying flows, etc. Tunnels are most often used in mountainous areas. Tunnels can be divided into two basic types, lined and unlined. ==Best Practices Resources== {{Document I..."