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Citations and many full text links to journals, monographs, and conference papers in the area of the environment, including agriculture, ecology, energy, natural resources, marine science, pollution and waste management, public policy, social impacts, and urban planning.
Index with some links to full text of the transportation literature including planning, finance, design and construction, materials, environmental issues, safety and human factors, and operations for highways, rapid transit, railroads, maritime and aviation.
Multi-disciplinary source for scholarly, popular, professional, and news publications. This is a good place to start many searches or to gather material from various disciplines at once. A good place to start for first and second year students.