Stringybark Poems   He left his imprint on the hills where he walked not with axe-marks on trees but in words that he spoke loudly—   that later became poems he wrote down in a book when he left the high country of waterfalls and frosty mornings.   In those poems he heard the songs of birds, sounds of cattle and sheep— the speech of country people who lived on farms or worked behind a counter in the General Store.   A farmer and his dog walked across a property called Wyatts Creek and he asked him if he ever…