Holcim Ltd, a Swiss-based supplier of concrete, crushed stone, sand and gravel, has agreed to provide in-kind donations worth roughly US$90,000 towards an effort to conserve murals painted on the walls of Bakong temple in Siem Reap, Soeung Kong, deputy director of the Apsara Authority, the body charged with managing Angkor Wat and other temples, said in an interview Tuesday. "They will help us with materials, workers and technical knowledge that will total about $90,000, though they won't provide any cash," he said. "We have to take it because the paintings are very old, and we have to protect them so they will last long enough for the next generation to see."