537.21 P Peirce, Benjamin Osgood, 1854-1914 Elements of the theory of the Newtonian potential function. 3ª ed. rev. and enl. ed. By B.O. Peirce. Boston, Gin & company, c1902. 490 p. diagr. 21 cm ´´Short list of works´´: p. v-vii