PROBABLY HOLDS THE MOST PROMISE AT THIS POINT.

♪♪♪ >> ERIC: THIS IS THE POINT IN THE SHOW WHEN WE USUALLY FIND OUT WHO KNEW THE ANSWER TO LAST WEEK'S MINNESOTA HISTORY QUESTION.

BUT WE STUMPED YOU THIS TIME.

NO ONE CORRECTLY GUESSED THE NAME OF OUR MYSTERY MINNESOTAN.

SO, LET'S GIVE IT ANOTHER SHOT WITH A FEW MORE CLUES.

OUR MYSTERY PERSON WAS BORN IN BELFAST, IRELAND, IN 1863 AND EVENTUALLY SETTLED IN WHAT WE NOW CALL SOUTH ST. PAUL.

IN 1885, THEY BEGAN A 36-YEAR CAREER, WHICH HELPED MAKE TRAVEL SAFE ON THE MISSISSIPPI RIVER.

THEIR DEDICATION TO THIS JOB EARNED THIS PERSON A PLACE IN THE NATIONAL RIVERS HALL OF FAME.

AND THEY ARE ALSO THE SUBJECT OF A SONG BY SINGER/SONGWRITER CHARLIE MAGUIRE.

YOUR TASK IS SIMPLE: TELL US WHO IS THIS MYSTERY MINNESOTAN AND WHAT MADE THEM FAMOUS?

WE WANT TO HEAR FROM YOU WHETHER YOU ARE CALLING FROM JANESVILLE, ROBBINSDALE OR DUNDAS, MINNESOTA.

651-229-1430 IS THE NUMBER TO CALL WITH ALL OF YOUR GUESSES.

YOU CAN ALWAYS DROP US A NOTE, TOO.

OUR ELECTRONIC INBOX IS ALMANAC@TPT.ORG.

WHILE YOU'RE ONLINE, HOP ON OVER TO OUR WEBSITE TPT.ORG/ALMANAC, YOU CAN REWATCH ANY PORTION OF TONIGHT'S SHOW.

OR CHECK OUT ONE FROM THE PAST THAT YOU MAY HAVE MISSED.

THAT'S ALL AT TPT.ORG/ALMANAC.

WE HAVE JUST ENOUGH TIME LEFT FOR SOME SHOW-ENDING MUSIC FROM THE ARCHIVES.

THIS WEEK IN 2007, SINGER/SONGWRITER ELIZA GILKYSON WAS IN THE STUDIO PERFORMING A SONG CALLED "GREEN FIELDS."

THANKS FOR WATCHING.

BE CAREFUL.

♪ ONCE THERE WERE GREEN FIELDS, KISS HAD BY THE SUN.

♪ ONCE THERE WERE VALLEYS WHERE RIVERS USED TO RUN.

♪ ONCE THERE WERE BLUE SKIES WITH WHITE CLOUDS HIGH BOVE.

♪ ONCE THEY WERE PART OF AN EVERLASTING LOVE ♪ ♪ WE WERE THE LOVERS WHO STROLLED THROUGH GREEN FIELDS ♪ ♪ GREEN FIELDS ARE GONE NOW GO, PARCHED BY THE SUN ♪ ♪ GONE FROM THE VALLEYS WHERE RIVERS USED TO RUN.

♪ GONE WITH A COLD WIND THAT SWEPT INTO MY... >> "ALMANAC" IS MADE POSSIBLE BY MEMBERS OF THIS PUBLIC TELEVISION STATION.

SUPPORT IS ALSO PROVIDED BY• GREAT RIVER ENERGY: PROVIDING WHOLESALE POWER TO 27 MINNESOTA ELECTRIC COOPERATIVES.

DELTA DENTAL OF MINNESOTA FOUNDATION: IMPROVING ORAL HEALTH WHILE ADVANCING SOCIAL EQUITIES.

DELTADENTALMN.ORG/TPT.

EDUCATION MINNESOTA: THE VOICE FOR PROFESSIONAL EDUCATORS AND STUDENTS THROUGHOUT THE STATE.

MORE AT EDUCATIONMINNESOTA.ORG.

AND PAINTCARE: HELPING MINNESOTA PAINT SMARTER TO PREVENT WASTE.

MORE AT PAINTCARE.ORG.

"ONE GREATER MINNESOTA" REPORTING ON "ALMANAC" IS MADE POSSIBLE IN PART BY THE OTTO BREMER TRUST, WHOSE MISSION IS INVESTING IN PEOPLE, PLACES AND OPPORTUNITIES IN OUR REGION.

>> "ALMANAC" IS A PRODUCTION OF TWIN CITIES PBS FOR THE STATIONS OF MINNESOTA PUBLIC TELEVISION ASSOCIATION.