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In page Mary Boyce:

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In 1963–64, Boyce spent a research year among orthodox Zoroastrians of the 24 villages of Yazd, Iran. The results of her research there were formative to her understanding of Zoroastrianism and she discovered that much of the previously established scholarship on the ancient faith was terribly misguided. In 1975, Boyce presented the results of her research at her Ratanbai Katrak lecture series at Oxford University. In the same year she published the first volume of her magnum opus, The History of Zoroastrianism, which appeared in the monograph series Handbuch der Orientalistik (Leiden:Brill). Her Ratanbai Katrak lecture series were published in 1977 as A Persian Stronghold of Zoroastrianism.[citation needed]