WILLIAMSPORT, Pa. -- On a farm north of this old timber town that stretches out along the banks of the Susquehanna River, Perry Landon's 82-year-old mother confronts the promises and trepidation of a new era of energy wealth. Trapped in the clay and minerals deposited under the 150-acre homestead in Tioga County where she lives is a slice of the region's multibillion-dollar bounty of natural gas. Today, as Landon tells it, a new phalanx of the deep-pocketed land speculators many thought left northern Pennsylvania's Allegheny Plateau with the lumber barons a century ago are busy poring through land records and knocking on doors. These people aren't after forestland. They're trying to lock up the underground riches in the nation's largest emerging energy basin.