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  2. Grade (climbing) - Wikipedia

    en.wikipedia.org/wiki/Grade_(climbing)

    The V-scale doesn't consider risk and is purely focused on the technical difficulty of the movements. [2] The V-scale is the dominant scale in North America, and it and the Font scale are the most dominant systems worldwide; beyond the easiest grades, the two systems can be almost exactly aligned in comparison tables. [2] [14]

  3. List of grade milestones in rock climbing - Wikipedia

    en.wikipedia.org/wiki/List_of_grade_milestones...

    The hardest boulder solved was at the boulder grade of V17 (9A) for men and V15/V16 (8C/8C+) for women. The hardest multi-pitch (or big wall) redpoint was at the grade of 9a+ (5.15a). The hardest single-pitch free solo was at the grade of 8c (5.14b), and the hardest multi-pitch (or big wall) free solo was at 7c+ (5.13a).

  4. File:Bailey Bridge Construction Manual.pdf - Wikipedia

    en.wikipedia.org/wiki/File:Bailey_Bridge...

    Original file (1,666 × 1,297 pixels, file size: 3.77 MB, MIME type: application/pdf, 373 pages) This is a file from the Wikimedia Commons . Information from its description page there is shown below.

  5. Seventh Cambridge Survey - Wikipedia

    en.wikipedia.org/wiki/Seventh_Cambridge_Survey

    Download as PDF; Printable version; In other projects ... Seventh Cambridge Survey; Map of the Milky Way from the 7C(G) ... The 7C Survey (7C) of radio ...

  6. List of bridges on the National Register of Historic Places ...

    en.wikipedia.org/wiki/List_of_bridges_on_the...

    This is a list of bridges and tunnels on the National Register of Historic Places in the U.S. state of Colorado. [ 1 ] Studies of Colorado's historic bridges, to assess which ones could qualify for National Register listing, were conducted in 1983, 1987, 2000, and 2011.

  7. Virginian and Ohio - Wikipedia

    en.wikipedia.org/wiki/Virginian_and_Ohio

    [10] [11] The V&O was a bridge route, and most mainline traffic was to and from points beyond the V&O. 30-40 trains per day were needed to carry the V&O traffic. An important concept was that the use of walk-around throttles enabled operators to follow their trains from point to point and eliminated the doubling back and running in circles ...

  8. Boulder Creek Bridge (Boulder, Colorado) - Wikipedia

    en.wikipedia.org/wiki/Boulder_Creek_Bridge...

    The Boulder Creek Bridge near Boulder, Colorado is a concrete slab and girder bridge which was built in 1953. It was listed on the National Register of Historic Places in 2003. [ 1 ]

  9. Hell's Backbone Road - Wikipedia

    en.wikipedia.org/wiki/Hell's_Backbone_Road

    Hell's Backbone Road is a 38-mile (61 km) gravel road that was built by the Civilian Conservation Corps in the 1930s, and connects the towns of Boulder, Utah and Escalante, Utah. Halfway along the road is Hell's Backbone Bridge, which is 109 feet (33 m) long, and 14 feet (4.3 m) wide. A 1,500-foot (460 m) drop is on either side. [1]