I'm the Guinness World Record holder for the largest graph paper collection in the world. I have 1300+ distinct sheets of graph paper! They are of many varieties: rectangular, polar, semilogarithmic, logarithmic, hyperbolic-reciprocal, isometric, isometric-orthographic, radio frequency, fluxolite (which you see as the background of this page -- isn't it cool?!), normal probability plot, Smith chart, data pad, trilinear, circular percentage, traverse sheet, plat paper. They were designed by many manufacturers: Keuffel and Esser, Dietzgen, National, Frederick Post, Graphic Controls, Champion Line, Aquabee, Miller, Alvin, Kay Electric, Mead, Vernon Royal, Ampad, Clearprint, Geyer, Pioneer, Citadel.