[etqwzutewzu]

"Isidore’s encyclopaedic work De natura rerum asserts that there are"

- but "De natura rerum" is Lucretius's poem

- Isidore of Seville's encyclopedia is "Etymologiae"

- "De rerum naturis" (De Universo) is Rabanus Maurus's encyclopedia

what is the correct one?

[etqwzutewzu]

(answering to myself) "De natura rerum" seems to be also the name of a part of Etymologiae (TBC)