Founded in 1903 to study plant adaptation to an arid desert environment with long term experiments, this laboratory contributed significantly to the formation of Ecology as a science. Part of the University of Arizona
When built in 1906–11, this was the highest masonry dam in the world, and the first major reclamation project dam in the western United States. It was substantially altered in 1989–96, enlarging the structure and encasing the original in concrete.[4]
↑ Numbers represent an alphabetical ordering by significant words. Various colorings, defined here, differentiate National Historic Landmarks and historic districts from other NRHP buildings, structures, sites or objects.
↑ The eight-digit number below each date is the number assigned to each location in the National Register Information System database, which can be viewed by clicking the number.
A National Historic Landmark (NHL) is a building, district, object, site, or structure that is officially recognized by the United States government for its outstanding historical significance. Only some 2,500, or roughly three percent, of over 90,000 places listed on the country's National Register of Historic Places are recognized as National Historic Landmarks.
This is a list of properties and historic districts in Tennessee that are listed on the National Register of Historic Places. There are over 2,000 in total. Of these, 29 are National Historic Landmarks. Each of Tennessee's 95 counties has at least one listing.
This is a directory of properties and districts listed on the National Register of Historic Places in Arizona. There are about fourteen hundred listed sites in the state, and each of its fifteen counties has at least ten listings on the National Register. Forty-seven of the state's sites are further designated as National Historic Landmarks.
This is a list of properties and historic districts in Arkansas that are listed on the National Register of Historic Places. There are more than 2,600 listings in the state, including at least 8 listings in each of Arkansas's 75 counties.
This is a list of the National Register of Historic Places listings in Washington County, Pennsylvania.
This is a list of the National Register of Historic Places listings in Maricopa County, Arizona, excluding those in Phoenix, for which see this separate list.
This is a list of properties on the National Register of Historic Places in northern New Castle County, Delaware.
The history of the National Register of Historic Places began in 1966 when the United States government passed the National Historic Preservation Act (NHPA), which created the National Register of Historic Places (NRHP). Upon its inception, the U.S. National Park Service (NPS) became the lead agency for the Register. The Register has continued to grow through two reorganizations, one in the 1970s and one in 1980s and in 1978 the NRHP was completely transferred away from the National Park Service, it was again transmitted to the NPS in 1981.
This is a list of the National Register of Historic Places listings in Bexar County, Texas.
This is a list of the National Register of Historic Places listings in Itasca County, Minnesota. It is intended to be a complete list of the properties and districts on the National Register of Historic Places in Itasca County, Minnesota, United States. The locations of National Register properties and districts for which the latitude and longitude coordinates are included below, may be seen in an online map.
This is a list of the National Register of Historic Places listings in Cass County, Minnesota. It is intended to be a complete list of the properties and districts on the National Register of Historic Places in Cass County, Minnesota, United States. The locations of National Register properties and districts for which the latitude and longitude coordinates are included below, may be seen in an online map.
This is a list of the National Register of Historic Places listings in Steele County, Minnesota. It is intended to be a complete list of the properties and districts on the National Register of Historic Places in Steele County, Minnesota, United States. The locations of National Register properties and districts for which the latitude and longitude coordinates are included below, may be seen in an online map.
This is a list of the National Register of Historic Places listings in Denton County, Texas.
List of Registered Historic Places in Clark County, Nevada, USA:
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