A legitimate, free, full PDF of the latest Santillana 3 ESO Geografia e Historia textbook does not legally exist online. Santillana protects its digital rights. However, legal digital access does exist.
Your best path forward is:
Many public libraries in Spain offer – a free digital lending service. You can borrow official digital textbooks (sometimes including Santillana or competing publishers like Anaya or Vicens Vives) for 14-21 days. You will need a library card from your autonomous community.
Searching for the Santillana 3 ESO Geografia e Historia PDF? Discover legal access options, digital alternatives, chapter-by-chapter summaries, and essential study resources for the Spanish secondary curriculum.
If a friend offers you a free PDF, politely decline. Instead, suggest pooling money together to buy a shared digital license (some platforms allow 2-3 devices per license) or ask the teacher to place a copy in the school library.