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By Kim Glovas

NAZARETH, Pa. (CBS) – A Lehigh Valley high school teacher who went backpacking in California’s Eastern Sierras earlier this summer, has been missing for over a month.

Thirty-nine-year-old Matthew Greene, a math teacher at Nazareth Area High School, has been missing since July 16th. He disappeared after his car broke down, and the group he was with continued on without him.

Search and rescue crews are facing a tough job.

“The difficulty they’re having is without knowing a departure point where Matthew took off into the mountains, there’s no where to search because there’s hundreds and hundreds of square miles just in our county,” says Dan Watson, chief of police in Mountain Lakes, the last place Greene was seen.

Watson says two other counties nearby have just as much. On Friday, a local hiker found a pair of glasses which investigators thought might be Greene’s. However, it turned out they were over the counter reading glasses, and not Greene’s prescription pair.

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