Here are a few Spanish language resources. Please feel free to share any others you know of in this thread.
Editorial Rudolf Steiner in Spain publishes the Maria Thun calendar, Steiner’s agriculture course, and a number of other BD books and guides. http://www.editorialrudolfsteiner.com/libros/agricultura-naturaleza-agricultura/
Various Spanish language resources are available through the respective websites of the Biodynamic Associations of Argentina, Chile, and Spain
Las Canoas Altas in Mexico has a Spanish description of biodynamics on their website.
The popular book "Sharing the Harvest, a citizen's guide to Community Supported Agriculture" is available in Spanish translation as an e-book.
Compartiendo la cosecha: Agricultura Apoyada por la Comunidad, una guía ciudadana
por Elizabeth Henderson y Robyn Van En