Melo, Corazon F. creator Pagaduan, Leandro Cruz, Milagros text Quezon City Katha Publishing Co., Inc. c1980 monographic viii, [150 p.] : tabs and figs. ; 23 cm. Corazon F. Melo, Leandro P. Pagaduan [and] Milagros A. Cruz. Mathematical concepts Fil. 510 M528 1980