ERRATA IN CHAPTER 8 (HARPER AND PIERCE) OF ATTAPL
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[All of these are corrected in the second printing.]

p. 295: "an signature" should be "a signature"

p. 306, line -1: m_2 should be m_1

p. 311: In figure 8-3, ! should be :>

p. 312, Just before "Determinacy and Adequacy": "must define Y" should be
  "must define the type of d"