A:
AGRICOLA (AGRICultural OnLine Access) - Search a bibliographic database of citations to the literature of agriculture [Department of Agriculture (USDA), Agriculture Research Service (ARS), National Agricultural Library (NAL)]

Ask an Earth Scientist - Answers specific questions related to volcanoes, earthquakes and seismology, natural hazards, environment and hydrology, sediments and sedimentary rocks, igneous rocks and minerals [National Aeronautics and Space Administration (NASA)]

B:
Botany - Major NBII website on botany linking to USGS and non-USGS websites on botanical science, paleobotany, plant functions, species, applied plant science, gardening, collections and organizations, botany for kids and teachers, and references [Department of the Interior, U.S. Geological Survey (USGS), National Biological Information Infrastructure]

C:
Climate Prediction Center - Famine Early Warning System Network (FEWS-Net); Mesoamerican Famine Early Warning System (MFEWS); Asian Flood Network (AFN). [Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Weather Service (NWS)]

E:
Environmental Measurements Laboratory Soil Sampling Program - Provide links to searchable information on DOE/EML's archived soil samples and sample measurements program since early 1950s to study global soil samples [Department of Homeland Security, Environmental Measurements Laboratory (EML)]

M:
Midcontinent Agricultural Chemical Research Program - Homepage for the research on occurrence, movement, flux, fate, and effects of agricultural chemicals, such as pesticides, in 25 states by the Midcontinent Agricultural Chemical Research Project (MACRP) with links to study results and publications. [Department of the Interior, U.S. Geological Survey (USGS)]

N:
National Agriculture Compliance Assistance Center - Is the first stop for information about environmental requirements that affect the agricultural community [Environmental Protection Agency (EPA)]

National Soil Erosion Research Laboratory (NSERL) - Carries out research on the processes of soil erosion by water to develop methods to control soil erosion and reduce its adverse environmental effects [Department of Agriculture (USDA), Agriculture Research Service (ARS)]

National Soil Mechanics Center (NSMC) - Provides a variety of services in a wide range of standard soil mechanics tests [Department of Agriculture (USDA), Natural Resources Conservation Service (NRCS)]

National Soil Tilth Laboratory (NSTL) - Research for the development and evaluation of management practices that enhance water quality while ensuring conservation of the nation's soil and water resources [Department of Agriculture (USDA), Agriculture Research Service (ARS)]

Natural Inquirer. - Scientific Research Geared Toward Middle School Students. [Department of Agriculture (USDA), Forest Service]

S:
Soil Quality Institute (SQI) - Identifies soil quality research findings and practical technologies that help conserve and improve soil, and enhance farming, ranching, forestry, and gardening enterprises [Department of Agriculture (USDA), Natural Resources Conservation Service (NRCS)]

Soil Series Classification Database - Search the taxonomic classification of each soil series identified in the United States [Department of Agriculture (USDA), Natural Resources Conservation Service (NRCS)]

Soils. - Provides state-of-the-art soil survey technology, standards, data, and expertise [Department of Agriculture (USDA), Natural Resources Conservation Service (NRCS)]

State of the Land - Provides data and analysis on land use, soil erosion and soil quality, water quality, wetlands, and other issues regarding the conservation and use of natural resources [Department of Agriculture (USDA), Natural Resources Conservation Service (NRCS)]