por Ayres, Frank, 1901- [autor] | Moyer, Robert E [autor] | Ruiz Sanchez, Maria Concepcion [traductor].
por Ayres, Frank, 1901- [autor] | Moyer, Robert E [autor] | Ruiz Sanchez, Maria Concepcion [traductor] | Ayres, Frank, 1901-. Schaum's outline of trigonometry.