An oral tobacco material includes a powdered tobacco, and a basic salt of carbonic acid and an acidic salt of phosphoric acid as a pH adjusting agent. In one embodiment, a method is described that includes determining a first waveform and a second waveform, the first waveform and second waveform related to a combined frequency spectrum and bandwidth associated with a geophysical survey line. Other applications are also described. The bearing unit further includes a path of a lubricant arranged to connect one side of one dynamic pressure generation portion and the intermediate portion. The plurality of fasteners secures the plate portion to the skid loader mounting portion.