Letters credit from http://kleinletters.com/.
1st appearance of Wally's Dad in series.
Letters from Geoff Gibson, Rick Bedard, John Gerdes, Ron Shook, Jeffrey Eernisse, Steffen Moebus, Clifford S. Gerstman, Craig D. Smith, Andy Sved, Dennis McDonough, Bob Craig, Russell Smith, Charlie Harris, and Elvis Orten.