TY  - GEN
T1  - Problemas Rubio. Sumar, restar, multiplicar, dividir.
LA  - Spanish
PP  - Valencia
PB  - Rubio
YR  - 1959
UL  - https://glotrec.wdi-testing.gei.de/cat/Record/manes16044
OP  - 28
ER  -