Building Materials Holding Corp., San Francisco, CA, announced it will close several additional facilities in an effort to continue to align costs with current market conditions. BMHC will close all of its operations located in Northern Nevada. Market consolidations will occur in Oregon, Washington, California, Texas, Colorado and Arizona. More Airgas, Inc., Radnor, PA, has acquired Great Lakes Oxygen, also doing business as Welder's Supply, Westside Welders Supply, Great Lakes Propane, and Lake Erie Iron and Metal. Since the beginning of its fiscal year in April, Airgas has completed 13 transactions with acquired annual revenues of more than $200 million.