DURING the week of October 23, WDCR celebrated the twentieth anniversary of radio broadcasting at Dartmouth College. The week was highlighted by a contest and by rebroadcasts of some of the most entertaining programs collected over the past twenty years. The WDCR contest gave away transistor radios to the five people who most nearly guessed the number of hours that Dartmouth radio has been on the air since 1941 — correct figure: 50,894 hours. Included in the rebroadcasts were a radio play, The Most Dangerous Game, from the old WDBS Workshop series; an interview with the explorer, Ivan T. Sanderson; and some selections from the Hunky-Dorey comedy hour, vintage 1952. On Thursday evening, October 26, the station presented a special hour-long program called Twenty Years Behind theMike. The show recalled some of the spectacular, and a few of the hilarious, things that can happen when you put an open microphone in front of a Dartmouth man.