California Native Plant Society 
This site is sponsored by a statewide non-profit organization
of amateurs and professionals with a common interest in California's
native plants.
The Core Historical Literature of Agriculture
This site has an electronic collection of agricultural texts published
between the early nineteenth century and the middle to late twentieth
century. Full-text materials cover agricultural economics, agricultural
engineering, animal science, crops and their protection, food science,
forestry, human nutrition, rural sociology, and soil science.
National Agricultural
Statistics Service.
This site sponsored by the USDA provides timely, accurate,
and useful statistics, news and publications on U.S. agriculture.
National Council for
Science and the Environment
Since 1990 NCSE, a non-profit organization, is dedicated to improving
environmental decisionmaking by ensuring that the scientific community,
public policymakers, educators, and citizens have access to accurate and
complete science-based information on the environment.
Plants Database
A searchable database sponsored by the Natural Resources Convervation
Service of the U.S. Department of Agriculture.