From The ARRL Contest Update: "Tom, N4TL, has assembled a checklist of NPOTA codes (PDF) <http://www.rars.org/ARRL%202016%20%20NPOTA%20Codes.pdf> to assist in the National Parks on the Air (NPOTA) operating event <http://www.arrl.org/npota> that is running all year." Tom is a Former Member of the SFDXA and good friend to many in the club... Bill W2CQ