Contents: 5 • Culturalanesthetics • [Editorial (Analog)] • essay by Stanley Schmidt 12 • Emergence • [Emergence (David R. Palmer)] • novella by David R. Palmer 52 • Biolog: F. Paul Wilson • [Biolog] • essay by Jay Kay Klein 53 • Mercury's Missing Divot • [Science Fact (Analog)] • essay by J. E. Enever 70 • Sailing, Through Program Management • short story by Al Charmatz 80 • Green Winter • short story by F. Paul Wilson 95 • The Most Valuable Books in the World • [The Alternate View] • essay by G. Harry Stine 98 • Expendable • short story by Charles V. De Vet 113 • Heroic Measures • short story by Edward Wellen 118 • Shuttle Down (Part 2 of 4) • serial by G. Harry Stine [as by Lee Correy] 163 • The Reference Library (Analog, January 1981) • [The Reference Library] • essay by Thomas A. Easton [as by Tom Easton] 170 • Brass Tacks & Letters 175 • AnaLog: A Calendar of Upcoming Events (Analog, January 1981) • [Upcoming Events] • essay by Anthony R. Lewis [as by Anthony Lewis] 176 • Index to 1980 • essay by uncredited.