The following list consists of organizations with informational materials available.  The materials range from instructional videotapes to text and reference books to computer software.  This is only a very small percentage of the information available.  With a little determination and perseverance you should be able to find what you're looking for.

The NHRAW Home Study Institute is an excellent resource for the HVAC professional.  Along with an extensive list of home study courses, factory training seminars listings, and contractor training seminars they offer workbooks and manuals on Materials Handling, the Basic Refrigeration Cycle, Gas Furnaces, Ductwork, Ladder Diagrams, Humidification, etc.  With no web site currently available, the NHRAW can be reached for more information by calling (614) 488-1835.

Cole-Parmer offers reference books, videos, and computer software about Chemistry, Computers, Environmental Engineering, Engineering, Mathematics, Safety, and Technical Communications.  They can be reached through the above link or by calling (800) 323-4340.

This appliance parts supplier from Omaha, Nebr., offers repair manuals for Dishwasher Repair, Refrigerator Repair, Clothes Dryer Repair, Washing Machine Repair, Domestic Refrigeration, Commercial Refrigeration, and Window Air Conditioners.  Call (800) 642-8500.

If you haven't heard of Grainger, you haven't been in the business long.  This giant supply house offers a library of technical reference manuals.  Topics include Electricity, Electronics, Plumbing, Refrigeration and Air Conditioning, Hydraulics, Welding, Pneumatics, etc.