"Lewis Research Center," . . "Solid lubrication." . . . . "Solid lubricants." . . "Rolling element bearings." . . "Gears." . . "Traction drives." . . "Boundary lubrication." . . "Tribology fundamentals." . . . . . . "Tribology the story of lubrication and wear"@en . . . . . . . . . "Story of lubrication and wear"@en . . . . . . . "Tribology : the story of lubrication and wear"@en . .