| PYTHAGOREAN PROPOSITION, 4#£ 5129 2252 Piz&, Pedro Antonio, 1895-= eos Fermagoric triangles, by Pedro A. Piz&. Santurce, P. R., Imprenta Soltero de Ramén Soltero Gelabert, 1945. 4 pele, 163, [1] pe, 1 1. inol. front., illus., diagrs. 22 om. (Official publication of the Polytechnic institute of Puerto Rico [no. 1])