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In the US in 2015, unincorporated self-employment rates were highest for workers in construction and extraction occupations (14.8 percent). [9] Construction workers can colloquially be referred to as "hard hat workers" or "hard hats", [10] as they often wear hard hats for safety while working on construction sites.
In 2011, national parks generated $30.1 billion in economic activity and 252,000 jobs nationwide. Thirteen billion of that amount went directly into communities within 60 miles of a NPS unit. In a 2017 study, the NPS found that 331 million park visitors spent $18.2 billion in local areas around National Parks across the nation.
The park ranger position was designated for "professional" work like management of the park (park ranger (manager)-park ranger (site manager)), or management of division (chief ranger, chief of interpretation). The park technician series was designed to handle routine technical skills, i.e., giving walks, talks, patrolling roads, fee collection ...
Skilled workers were the heart of the labor movement before World War I but during the 1920s, they lost much of their enthusiasm and the movement suffered thereby. [5] In the 20th century, in Nazi Germany, the lower class was subdivided into: agricultural workers, unskilled and semi-skilled workers, skilled craft workers, other skilled workers and
Blue-collar work may involve skilled or unskilled labor. The type of work may involve manufacturing, retail, warehousing, mining, excavation, carpentry, electricity generation and power plant operations, electrical construction and maintenance, custodial work, farming, commercial fishing, logging, landscaping, pest control, food processing, oil ...
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The total area protected by national parks is approximately 52.4 million acres (212,000 km 2), for an average of 833 thousand acres (3,370 km 2) but a median of only 220 thousand acres (890 km 2). [8] The national parks set a visitation record in 2021, with more than 92 million visitors. [9]
[verification needed] Assumptions on the hierarchies of unskilled, semi-skilled and skilled laborers and their supervisors and managers still linger on; however an example of a more contemporary approach to handle design applicable to manufacturing facilities can be found in Socio-Technical Systems (STS).