The type of connection that the author makes between the ideas given in the sentences is: description.
A description refers to an explanation, regularly detailed, about a person, a place or a thing, that is, a noun in general, said description can refer to its physical appearance, its feelings or thoughts, and even its history.
In the case of the given information, the author explains how The Diamond Sutra, the oldest printed book on record, was made, mentioning a little about its year of printing and the method used to make it.
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