THE RPTR; AN INSTRUCTOR PLT; FLEW A L HAND PATTERN AT AN UNCTLED ARPT TO A RWY WHERE A R HAND PATTERN EXISTS; CALLED ON THE WRONG CTAF FREQ; AND CUT IN FRONT OF ANOTHER AIRPLANE ON FINAL APCH CAUSING HIM TO HAVE TO GAR. THE RPTR STATED A COMMERCIAL GUIDE SAID THE PATTERN WAS L; AND HE MISREAD THE WASHINGTON SECTIONAL TO OBTAIN THE WRONG FREQ FOR THE CTAF. THE RPTR WAS APOLOGETIC.

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ENTERED SFQ TFC PATTERN AT 45 DEG DOWNWIND L HAND PATTERN FOR RWY 25. A COMMERCIAL GUIDE FOR SFQ INDICATES L HAND TFC. ARPT SEGMENTED CIRCLE INDICATES R HAND TFC; BUT IT'S NOT VERY VISIBLE FROM ABOVE. IT BLENDS IN WITH BROWN WINTER GRASS. I HAD PREVIOUSLY OVERFLOWN ARPT AT 1500 FT TO DETERMINE WIND DIRECTION. I OBSERVED NO TFC AND UNICOM DID NOT ANSWER ON 122.8. I SELF-ANNOUNCED MY PATTERN ENTRY; AND WHILE DOWNWIND OBSERVED A LOW WING PIPER ON FINAL. I CALLED BASE AND FINAL. WHILE IN A L TURN FROM BASE TO FINAL; I OBSERVED A HIGH WING TAILWHEEL CESSNA ALSO TURNING FINAL BUT FROM A R BASE. I WAS BELOW HIM AND AT LEAST 1/2 MI FROM HIM IN SINCE I WAS FLYING A TIGHTER PATTERN. I CONTINUED MY APCH AND LANDED AND HE WENT AROUND. NEITHER OF US HAD TO TAKE EVASIVE ACTION. I KEPT HIM IN SIGHT AFTER TURNING TO FINAL AND WHILE ROLLING OUT. WHILE TAXING IN; I NOTICED THE SEGMENTED CIRCLE INDICATING R HAND TFC. OBVIOUSLY I WAS FLYING THE WRONG PATTERN. AFTER HE LANDED; I WENT UP TO THE OTHER PLT AND APOLOGIZED. TO MAKE MATTERS WORSE; I WAS ALSO ON THE WRONG CTAF FREQ; SFQ IS 122.7. I GOT 122.8 OFF THE WASHINGTON SECTIONAL. 122.8 IS PRINTED RIGHT NEXT TO THE SFQ NDB NAVID BOX; BUT IT IS FOR GRASSO; A PVT AIRSTRIP. THE ARPT DATA FOR SFQ WAS LOCATED A LITTLE HIGHER ON THE CHART; BUT CLRLY LEGIBLE.