The phrase "are attested in the" is correct and usable in written English.
It can be used when discussing evidence or documentation that supports a claim or existence of something, often in academic or formal contexts.
Example: "The findings of the study are attested in the research conducted over the past decade."
Alternatives: "are documented in the" or "are verified in the".
Parks and gardens are attested in the land of Iran from the sixth century BC, when the Greek historian Herodotus tells us that the Persian kings liked gardening.
Various titles are attested in the tradition: Introduction to the Topics, On the Genera of Being, On the Ten Genera, The Ten Categories, Categories (Simplicius, In Cat. 15. 26 30).
Gná and Hófvarpnir are attested in the Prose Edda, written in the 13th century by Snorri Sturluson.
The Upper Paleolithic and late Bronze Age cultures are attested in the caves of Tağılar, Damcılı, Zar, Yataq-yeri and in the necropolises of Leylatepe and Saraytepe.
They are attested in the Poetic Edda, a collection of epic poetry compiled in the 13th century from earlier traditional sources, in the Prose Edda, written in the 13th century by Snorri Sturluson, and in the poetry of skalds.
Sumarr and Vetr, personified, are attested in the Poetic Edda, compiled in the 13th century from earlier traditional sources, and the Prose Edda, written in the 13th century by Snorri Sturluson.
We can't rule on "crass", but "unfeasible" is attested in the OED from 1527 to the present day, and "infeasible" (first attested 1533) is indeed marked as "now rare".
By the time Iranian begins to be attested in the 6th century bce, the language is already found differentiated into several distinct languages.
The early popularity of subject matter based on Celtic tradition is attested in the five songs based on Breton lays with which the Cancioneiro da Biblioteca Nacional opens.
Dr. Lionel Casson, an author and a retired professor of classics at New York University, said, "It's nice to have archaeologists find concrete evidence for what is attested in the texts".
