600 - Technology

• find out How Stuff Works
  http://www.howstuffworks.com

610 - Medicine

• Center for disease control
  http://www.howstuffworks.com
• Links to many diseases from KidsHealth.org
  http://kidshealth.org/kid/health_problems/index.html
• This professional/commercial site is specific to various cancers
  http://www.oncology.com/ndgDefault/0,18773,_12|00379|00_21|001,00.html

620 - Engineering

• Invention timeline from PBS
  http://www.pbs.org/wgbh/amex/telephone/timeline/timeline_text.html

630 - Agriculture

• The National Agricultural Library - a great place to start
  http://www.nal.usda.gov/
• The US Department of Agriculture
  http://www.usda.gov/wps/portal/usdahome
• A site with many links is sponsored by a seed company
  http://www.agriculture.com/
• Success Farming Magazine - the online version
  http://www.agriculture.com/sfonline/
• This is a useful site for sustainable
  http://www.ibiblio.org/farming-connection/
• A good source for alternative farming systems from the National Agricultural Library
  http://www.nal.usda.gov/afsic/
  

640 - Home economics

• A starting point for cross-stitching and other crafts
  http://crossstitch.about.com/hobbies/crossstitch/mbody.htm
• Explanations and animated examples of many kinds of stiches
  http://members.bellatlantic.net/~cfitzger/Needle/contents.html
• This is a commercial site but a great starting point for recipes
  http://foodtv.com/
• Another source of recipes
  http://www.epicurious.com/

650 - Management

660 - Chemical Engineering

670 - Manufacturing

680 - Manufacture for specific uses

690 - Buildings