00447nam a2200133 i 4500001000700000003000900007007000300016008004100019100002600060245012300086260004800209300003500257852002100292142084ES-MaACLt|071002s1920    xxk          ||||1| eng d1 aWilliamson, Benjamin.13aAn elementary treatise on the differential calculus, containing the theory of plane curves / cby Benjamin Williamson.  aLondon : bLongmans, Green and Co., c1920.  aXVI, 472 p. : bil. ; c19 cm.  aES-MaACLjB-4165