The following links provide useful information about engineering and structural design;
Structural Engineering Portal
American Wood Council; includes extensive alphabetical listing of additional links
APA - Engineered Wood Association; extensive publications about wood I-joists
Listing of steel shape design properties, by "Engineers Edge"
Accuracy of listings has not been verified.
Extensive listing of government agency web sites related to construction, by state;
Google Search Tips, including unit conversion
Earthquake information, detailed, very good;
About home inspection;