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H. Paul Ecker
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![Handbook for Supervisors [by] H. Paul Ecker, Vernon Ouellette [and] John MacRae](/_next/image?url=https%3A%2F%2Fstorage.googleapis.com%2Fmenrva_img_storage%2Fcovers%2F9780133727630_3793412b.jpg&w=3840&q=80)