How can I find the Haftorah reading from my Bar Mitzvah?

I am a 57 years old non observant Jew and my Bar Mitzvah was held on November 9 1980. I have been reading the Tanakh recently. Is there a way I can figure out what my Haftorah passage was on my Bar Mitzvah? It was held on Sunday November 9, 1980. I do vaguely remember it was from the book of Numbers.