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  2. List of the oldest buildings in Ohio - Wikipedia

    en.wikipedia.org/wiki/List_of_the_oldest...

    be a recognizable building (defined as any human-made structure used or intended for supporting or sheltering any use or continuous occupancy); incorporate features of building work from the claimed date to at least 1.5 metres (4.9 ft) in height and/or be a listed building. This consciously excludes ruins of limited height, roads and statues.

  3. Marble Cliff Quarry Co. - Wikipedia

    en.wikipedia.org/wiki/Marble_Cliff_Quarry_Co.

    The company grew through the expansion of stone grades from one to six and market-specific divisions that cater their products to specific industries, and at one point employed as many as 500 men. [ 4 ] [ 3 ] By 1928, Marble Cliff Quarry was producing 3 million tons of stone per year, and purchased land in Muskingum County to expand their ...

  4. Engineered stone - Wikipedia

    en.wikipedia.org/wiki/Engineered_stone

    Engineered stone is a composite material made of crushed stone bound together by an adhesive to create a solid surface. The adhesive is most commonly polymer resin, with some newer versions using cement mix. This category includes engineered quartz (SiO 2), polymer concrete and engineered marble stone. [1]

  5. Helenite - Wikipedia

    en.wikipedia.org/wiki/Helenite

    Although helenite and obsidian are both forms of glass, helenite differs from obsidian in that it is man-made. The stone has been marketed by the jewelry industry because of its emerald-like color, good refractive index, although its durability is low. It has a hardness of just 5 to 5 ½ and chips about as easily as obsidian or window glass.

  6. Mound Builders - Wikipedia

    en.wikipedia.org/wiki/Mound_Builders

    Naturally enough, it became known as the Decalogue Stone. Rather than being found beneath only a foot or two of soil, the Decalogue Stone was claimed to have been buried beneath a forty-foot-tall stone mound. Instead of modern Hebrew typography, the characters on the stone were blocky and appeared to be an ancient form of the Hebrew alphabet.

  7. List of National Historic Landmarks in Ohio - Wikipedia

    en.wikipedia.org/wiki/List_of_National_Historic...

    This is a list of National Historic Landmarks in Ohio and other landmarks of equivalent landmark status in the state. The United States' National Historic Landmark (NHL) program is operated under the auspices of the National Park Service, and recognizes structures, districts, objects, and similar resources according to a list of criteria of national significance. [6]

  8. National Register of Historic Places listings in Franklin ...

    en.wikipedia.org/wiki/National_Register_of...

    April 11, 1979 (56 N. High St. Dublin: 6: Bank Block Building: Bank Block Building: September 15, 1997 (1255-1293 Grandview Ave. Grandview Heights: 7: Barnhardt-Bolenbaugh House

  9. National Register of Historic Places listings in Warren ...

    en.wikipedia.org/wiki/National_Register_of...

    November 17, 1977 (North St. Harveysburg: 22: Hatton Farm: Hatton Farm: March 29, 1978 (East of central Harveysburg on State Route 73: Harveysburg: 23: Hill-Kinder Mound: Hill-Kinder Mound