the writing system. Although some specifics of his decipherment claims were later shown to be incorrect, the central argument of his work, that Maya hieroglyphs were phonetic (or more specifically, syllabic), was later supported by the work of Yuri Knorozov (1922–1999), who played a major role in deciphering Maya writing. Napoleon Cordy also made some notable contributions in the 1930s and 1940s to the early study and decipherment of Maya script, including "Examples of Phonetic Construction in Maya Hieroglyphs", in 1946. In 1952 Knorozov published the paper "Ancient Writing of Central America", arguing that the so-called "de Landa alphabet" contained in Bishop Diego de Landa's manuscript Relación de las Cosas de Yucatán was made of syllabic, rather than alphabetic symbols. He further improved his decipherment technique in his 1963 monograph "The Writing of the Maya Indians" and published translations of Maya manuscripts in his 1975 work "Maya Hieroglyphic Manuscripts". In the 1960s, progress revealed the dynastic records of Maya rulers. Since the early 1980s scholars have demonstrated that most of the previously unknown symbols form a syllabary, and progress in reading the Maya writing has advanced rapidly since. As Knorozov's early essays contained several older readings already published in the late 19th century by Cyrus Thomas, and the Soviet editors added propagandistic claims to the effect that Knorozov was using a peculiarly "Marxist-Leninist" approach to decipherment, many Western Mayanists simply dismissed Knorozov's work. However, in the 1960s, more came to see the syllabic approach as potentially fruitful, and possible phonetic readings for symbols whose general meaning was understood from context began to develop. Prominent older epigrapher J. Eric S. Thompson was one of the last major opponents of Knorozov and the syllabic approach. Thompson's disagreements are sometimes said to have held back advances in decipherment. For example, says "the major reason was that almost the entire Mayanist field was in willing thrall to one very dominant scholar, Eric Thompson". G. Ershova, a student of Knorozov's, stated that reception of Knorozov's work was delayed only by authority of Thompson, and thus has nothing to do with Marxism – "But he (Knorozov) did not even suspect what a storm of hatred his success had caused in the head of the American school of Mayan studies, Eric Thompson. And the Cold War was absolutely nothing to do with it. An Englishman by birth, Eric Thompson, after learning about the results of the work