MISSOULA, Montana — With less than three weeks to find a buyer for a Seeley lumber mill, some Missoula legislators are asking the state land board for some leadership in keeping the mill open. On Monday, three Democratic legislators sent a letter to the five members of the Montana Land Board, asking them to help preserve existing lumber mills after two in Missoula County have announced they’re shutting down. “Absent a viable timber industry, the ability of the State to manage its lands and produce revenue will be severely compromised,” the legislators wrote. In mid-March, Pyramid Mountain Lumber in Seeley Lake announced it was closing after 75 years. Although Roseburg Forest Products won’t reopen, the owners of Pyramid Mountain Lumber are considering selling their business instead of shutting it all down.