AN ACR MLG CREW FOUND SOME FREQS IN USE THAT ARE NOT PUBLISHED FOR FLC EYES.

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THIS IS A SAFETY RELATED RPT ONLY. NORMAL VFR RWY 31 STADIUM VISUAL APCH DFW. AT THE FINAL APCH FIX; I WENT TO TWR FREQ BUT I HAD MISTAKENLY DIALED IN 127.55 INSTEAD OF 127.50. MEANWHILE; I WAS DIALING IN DFW GND FREQ OVER THE OLD APCH FREQ ON THE SAME RADIO. OF COURSE; NO CONTACT WITH TWR. I CHKED THE APCH PLATE FOR THE CORRECT RWY 31R TWR FREQ -- NOTHING EVEN CLOSE PUBLISHED. I WENT TO 126.55; E RWY FREQ; BUT COULD NOT GET A WORD IN DUE FREQ CONGESTION. REDIALED IN OLD APCH FREQ THAT I SOMEHOW REMEMBERED. GOT THE CORRECT 127.5 FREQ; DIALED THAT IN AND GOT CONTACT AND LNDG CLRNC AT ABOUT 300 FT. CAPT WAS JUST INITIATING GAR WHEN CLRNC WAS RECEIVED. LANDED OK. THEN ON GND; WAS TOLD TO USE GND FREQ 134.05. THAT FREQ ISN'T PUBLISHED EITHER BUT IT IS USED OFTEN. THESE FREQS SHOULD BE PUBLISHED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: DFW TWR USES UP 6 FREQS FOR LCL CTL AND 4 FOR GND CTL. ONLY 2 FREQS OF EACH CATEGORY ARE PUBLISHED. IN 'BUSY' TIMES; 4 LCL AND 3 GND FREQS ARE USED. ONLY THE PUBLISHED 2 FREQS OF EACH CATEGORY ARE USED IN 'NORMAL' TFC SITS.