Help to find a childhood song from the 70s

I spent my early childhood in the highlands and in Port Moresby where my father helped establish the medical school. I have a  song that I have been singing since I was seven and had always thought it was the national anthem until a few years ago when I heard the beautiful  'sons arise' anthem. I would dearly love to know what this song is and to find the correct words as I am sure my seven year old memory (I'm now 54) is faulty. Is there anyone  in the community who can help?