Maro, Publius Vergilius (Virgil). Georgicorum Libri Quatuor (Four Books of Georgic). c 29 BC:

“P Vergili Maronis: Georgicon” in Haverfield, Francis, ed. The Works of Virgil: Vol I. Eclogues and Georgics, Fifth Edition, pp135-401. London: George Bell and Sons, 1898.
https://ia902702.us.archive.org/32/items/worksvirgil00havegoog/worksvirgil00havegoog.pdf

‘The Georgics by Virgil: Publi Vergili Maronis: Georgicon’ at Free eBooks | Project Gutenberg, 3 April 2008.
https://www.gutenberg.org/cache/epub/231/pg231.txt

Georgicon on ‘Vergil (P Vergilivs Maro (70 – 19 BC))’ at The Latin Library.
http://www.thelatinlibrary.com/verg.html