Mark Addison, 22, disappeared from San Luis Obispo, California, on September 4, 1982, after saying he planned to go into the mountains and live off the land. He had recently bought camping gear and told others of that intention. A few days later his vehicle was found abandoned in Bakersfield, but no confirmed sightings or additional clues have emerged since.

At the time he vanished he was described as about 5 feet 9 inches tall, 160 to 170 pounds, with the tip of the middle finger on his left hand missing. He was last seen wearing Levi’s jeans, a blue/gray plaid shirt and a green and white baseball jersey. The case is classified as endangered missing and the San Luis Obispo Police Department continues to investigate, though searches have not produced answers.

What can readers who knew Mark, his travel plans, or the areas between San Luis Obispo and Bakersfield add to help piece together his last known movements?