Many regions have microsites where Santillana shares sample units and "fichas de refuerzo" (reinforcement worksheets) for free.
In many countries, the Ministry of Education provides digital versions of the adapted Santillana texts through their official portals. libros santillana primaria pdf
: A platform used to host Santillana's digital content, including workbooks and teacher guides. Santillana.es Teacher and Student Support Materials Many regions have microsites where Santillana shares sample