For the record, the text in the carving is the first two pages of the 1446 work "Hunmin Jeong-eum Haerye" (Explanations and Examples of the Proper Sounds for the Education of the People), one of the texts which explained how the new (at the time) Hangul alphabet worked. Since Chinese characters (hanja) were used before Hangul was invented, the text is primarily written that way.
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More info)
You can see the orignal pages
here. It looks like the print on the block was printed from these images
