Graded readers are texts that have been adapted for language learners and target a specific level of reader.
Lecturas fáciles en español series by enCLAVE ELE
These texts are marked with the Common European Framework of Reference for Languages (CEFRL) ratings (guidelines used to describe achievements of learners of foreign languages).
Adapted classics are shortened versions of classic texts.
Bilingual readers have the Spanish and English text side by side so you can practice and improve your reading skills in Spanish while having the English text at hand to refer to.
Hispanic Texts series. Manchester University Press.
Spanish texts series. Bristol Classical Press.