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This 2021 Edition of the Roadway Engineering Group Roadway Design Guidelines supersedes the 2012 Edition and incorporates the 2014 revisions along with several new revisions affecting bicycle and pedestrian accommodations, passing sight distance, barrier treatments, land and shoulder widths, fencing, design vehicles, and detours.

Carrichtera annua (Ward's weed) is an annual herb (family Brassicaceae) with white to yellow flowers and hairy lobed leaves found in the south coast ranges of California.

Contrast of Phoenix and Tucson’s different approaches to urban water management—Phoenix leaning heavily on supply augmentation and growth-first policies, while Tucson adopted earlier and more aggressive conservation strategies—highlighting how these divergent paths shape their sustainability and resilience in a water-scarce desert environment

As the worsening drought crisis continues to impact communities across the West, the Department of the Interior today announced urgent action to improve and protect the long-term sustainability of the Colorado River System, including commitments for continued engagement with impacted states and Tribes.

The purpose of the withdrawal requested is to protect the lands pending conveyance to the Town of Superior (Town), Pinal County, Arizona as directed by Congress.

List of noxious weeds from the USDA

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