The HVAC/R professional reference contains more than 500 pages of extensive information on such important topics as refrigeration systems, piping, ductwork, motors, compressors, fans, pumps and more. Practical troubleshooting techniques and service call procedures for understanding and maintaining a[...]

The NEC is updated every 3 years with some of the anticipated changes include new requirements to sections while some of the changes include entirely new articles. Some changes are revisions to existing requirements while others are deletions to some existing requirements. As with the last edition o[...]

Uses three themes to show how the United States was transformed from hunter-gatherer and agricultural Native American societies into the powerful industrial nation on earth. This title includes approach that helps students understand the impact of the notions of liberty and equality, which are often[...]

Uses three themes to show how the United States was transformed from hunter-gatherer and agricultural Native American societies into the powerful industrial nation on earth. This title includes an approach that helps students understand the impact of the notions of liberty and equality, which are of[...]