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Those who have not used computers and are suddenly placed in front of a Pentium will be expected to experience a learning curve , but many older persons are eager to become proficient and they have the time to learn . I hope that on this occasion at least some of them will remember that those who will not learn from history are often fated to repeat it . Readers learn to develop sophisticated analytical skills by implementing axis methodology presented in a step-by-step manner , along with hundreds of practice EKGs and full answers at the end of each chapter . Environmental justice studies may be good opportunities for students to learn GIS in society concepts while providing assistance to local citizens .