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Full-Text Articles in Physical Sciences and Mathematics

Escalante Valley - Iron County, Utah, Rapid Watershed Assessment - 8 Digit Huc #16030006, Usda-Nrcs May 2007

Escalante Valley - Iron County, Utah, Rapid Watershed Assessment - 8 Digit Huc #16030006, Usda-Nrcs

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This rapid assessment is designed to gather and display information specific to the basin identified. This summary will highlight the natural and social resources present in the basin, detail specific concerns, and aid in resource planning and target conservation assistance needs. This document is dynamic and will be updated as additional information is available through a multi-agency partnership effort.


Weed Control Methods Handbook: Tools & Techniques For Use In Natural Areas, Mandy Tu, Callie Hurd, John M. Randall, The Nature Conservancy Apr 2001

Weed Control Methods Handbook: Tools & Techniques For Use In Natural Areas, Mandy Tu, Callie Hurd, John M. Randall, The Nature Conservancy

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Invasive non-native plants are a serious threat to native species, communities, and ecosystems in many areas around the world. They can compete with and displace native plants, animals, and other organisms that depend on them, alter ecosystem functions and cycles significantly, hybridize with native species, and promote other invaders. The good news is that many plant invasions can be reversed, halted or slowed, and in certain situations, even badly infested areas can be restored to healthy systems dominated by native species. In most instances this requires taking action to control and manage those invasive plants. This handbook provides you with …


Race, Ethnicity And Use Of The National Park System, Dr. Myron Floyd, National Park Service, Department Of The Interior Apr 1999

Race, Ethnicity And Use Of The National Park System, Dr. Myron Floyd, National Park Service, Department Of The Interior

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This paper reviews the social science literature on racial and ethnic minority use of the National Park System. Four theoretical perspectives are examined--the marginality hypothesis, subcultural hypothesis, assimilation theory, and the discrimination hypothesis. Each perspective is described, and its strengths and limitations discussed. Research on race, ethnicity, and participation in outdoor recreation is also examined. Studies consistently show that racial and ethnic groups visit national parks and participate in recreation activities at differing rates. The style and pattern of park use also vary among racial and ethnic groups. Social science research on this topic can help park managers serve the …


Use Of Multispectral Scanner Images For Assessment Of Hydrothermal Alteration In The Marysvale, Utah, Mining Area, United States Geological Survey Jan 1982

Use Of Multispectral Scanner Images For Assessment Of Hydrothermal Alteration In The Marysvale, Utah, Mining Area, United States Geological Survey

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Multispectral images of an area near Marysvale, Utah, were collected by using the airborne U.S. National Aeronautics and Space Administration (NASA) 24-channel Bendix multispectral scanner; they were analyzed to define areas of hydrothermally altered, potentially mineralized rocks. Hydrothermally altered rocks, particularly volcanic rocks affected by solutions rich in sulfuric acid, are commonly characterized by concentrations of argillic minerals such as alunite and kaolinite. These minerals are important for identifying hydrothermally altered rocks in multispectral images because they have an intense absorption band centered near a wavelength of 2.2 um. Unaltered volcanic rocks commonly lack these minerals and hence do not …


Evaluation Of Areas For Off-Road Recreational Motorcycle Use, Volume I: Evaluation Method, United States Army Corps Of Engineers Jan 1980

Evaluation Of Areas For Off-Road Recreational Motorcycle Use, Volume I: Evaluation Method, United States Army Corps Of Engineers

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To answer user demands for more areas on which to operate off-road recreational motocycles (trailbikes), and to respond to Presidential Executive Orders which require that Federally-owned lands be evaluated for such use, Army land managers need a systematic way of determining land use suitability. This report describes the method developed by the U.S. Army Construction Engineering Research Laboratory (CERL) to help installation personnel comply with the policies, procedures, and criteria of Army Regulation (AR) 210-9, Use of Off-Road Vehicles on Army Lands.


Evaluation Of Areas For Off-Road Recreational Motorcycle Use, Volume Ii: Alternate Soil Suitability Determination Methods, United States Army Corps Of Engineers Jan 1980

Evaluation Of Areas For Off-Road Recreational Motorcycle Use, Volume Ii: Alternate Soil Suitability Determination Methods, United States Army Corps Of Engineers

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Volume I of this report described how to evaluate the soil suitability of areas for off-road recreational motorcycle (trailbike) use on land under the jurisdiction of the Department of the Army. This soil evaluation method relied on the availability of a recent, detailed soil survey. Since such surveys are not always available, Volume II describes alternative methods of evaluating the suitability of soils for trailbike use. Volume II illustrates and describes seven alternative soil evaluation methods. Each method is defined as more or less useful in terms of its reliability and the ease and speed by which its results may …