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  2. Cloquet Terminal Railroad - Wikipedia

    en.wikipedia.org/wiki/Cloquet_Terminal_Railroad

    Cloquet Terminal Railroad (reporting mark CTRR) is a small Class 3 terminal railroad operating 6 miles (9.7 km) of track in Cloquet, Minnesota.The railroad interchanges with the Burlington Northern Santa Fe and Canadian Pacific railroads in Cloquet and services the Sappi Paper Mill, a USG Ceiling Tile plant and a SMI Plant on the mill site.

  3. Floor and ceiling functions - Wikipedia

    en.wikipedia.org/wiki/Floor_and_ceiling_functions

    In mathematics, the floor function is the function that takes as input a real number x, and gives as output the greatest integer less than or equal to x, denoted ⌊x⌋ or floor(x). Similarly, the ceiling function maps x to the least integer greater than or equal to x, denoted ⌈x⌉ or ceil(x). [1]

  4. USG Corporation - Wikipedia

    en.wikipedia.org/wiki/USG_Corporation

    USG Corporation, also known as United States Gypsum Corporation, is an American company which manufactures construction materials, most notably drywall and joint compound. The company is the largest distributor of wallboard in the United States and the largest manufacturer of gypsum products in North America.

  5. Dropped ceiling - Wikipedia

    en.wikipedia.org/wiki/Dropped_ceiling

    Dropped ceiling featuring ceiling tiles, lights, air diffusers, smoke detector, and more Dropped ceiling with ceiling tile light fixture. A dropped ceiling is a secondary ceiling, hung below the main (structural) ceiling. It may also be referred to as a drop ceiling, T-bar ceiling, false ceiling, suspended ceiling, grid ceiling, drop in ceiling ...

  6. Sound transmission class - Wikipedia

    en.wikipedia.org/wiki/Sound_transmission_class

    Sound Transmission Class (or STC) is an integer rating of how well a building partition attenuates airborne sound.In the US, it is widely used to rate interior partitions, ceilings, floors, doors, windows and exterior wall configurations.

  7. Play Hearts Online for Free - AOL.com

    www.aol.com/games/play/masque-publishing/hearts

    Enjoy a classic game of Hearts and watch out for the Queen of Spades!

  8. Noise reduction coefficient - Wikipedia

    en.wikipedia.org/wiki/Noise_reduction_coefficient

    The NRC is highly dependent on the type of mounting, [6] which, if not specified, is usually a Type A mounting (ABPMA mounting #4) where the material is placed directly on the floor, wall, or ceiling. Acoustical ceiling tiles are often tested in Type E400 mounting, which simulates a 16-inch-deep (410 mm) plenum.

  9. Researchers document huge drop in African elephants in a half ...

    www.aol.com/news/researchers-document-huge-drop...

    African elephants are Earth's largest land animals, remarkable mammals that are very intelligent and highly social. Fresh evidence of this comes in a study that documents alarming population ...