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This straightforward tutorial on leaf identification comes from the Department of Horticulture at Penn State University. Simple diagrams, helpful photos, and clear explanations make short work of learning the basics of...
Andrew Carnegie was known for his philanthropy, and in 1895 he contributed his vast wealth to creating 22 various organizations that still bear his name. In 1901 he created what became known as the Carnegie Institution...
USGS Water Management: The USGS provides maps, reports, and information to help others meet their needs to manage, develop, and protect America's water, energy, mineral, and land resources. Some of the seventeen topics...
This site, presented by the University of Nebraska - Lincoln Extension, discusses the principles, processes and requirements of activated carbon filtration systems for the domestic (household) user. The site addresses...
This web site showcases Lenntech's Complete Water treatment and Air filtration solutions. This company designs, manufactures and installs complete air and water treatment system solutions. Lenntech proclaims, "Our wide...
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