arithmetic Lotho, Catalina Catipon, Julio Eleazar, Maria Marquez, Lualhati Dilao, Soledad text Metro Manila Vibal Publishing House, Inc. c1985 monographic 249 p. : tabs and figs. ; 26 cm. Catalina Lotho [et al.]. Arithmetic Mathematics Fil. 510 M426 1985 971070690X