The single most important source for Yucatec Maya religion was written by the man most responsible for destroying the evidence, and that paradox governs how the subject is studied.
Diego de Landa, a Franciscan who arrived in Yucatan in 1549, conducted an inquiry into continuing idolatry among converts in 1562, using torture, and burned a quantity of Maya books and images at Mani. He was recalled to Spain to answer for exceeding his authority, was cleared, and later returned as bishop. During or after that period he compiled an account of Yucatec life, the Relacion de las cosas de Yucatan, which describes the calendar, the ceremonies of the year, the gods, agricultural practice, and the script.
His attempt at the script was wrong in method and decisive in effect. He asked an informant for the letters of the Maya alphabet and wrote down the signs given, producing what is in fact a list of syllables. For four centuries that list was read as a failed alphabet and dismissed; when Yuri Knorozov in the 1950s treated it as syllabic instead, it became the key to decipherment, and the Maya script is now largely readable.
So the surviving books were burned by the author of the document that made the surviving inscriptions legible. The atlas records both facts together, because reading Landa without the first is how his account came to be trusted uncritically for so long.