These are the two articles I have in mind.
https://www.backyardchickens.com/articles/why-chickens-bath-in-dust-and-not-in-water.74441/
https://www.backyardchickens.com/articles/the-chicken-keepers-health-armoury.75220/
https://www.backyardchickens.com/articles/why-chickens-bath-in-dust-and-not-in-water.74441/
https://www.backyardchickens.com/articles/the-chicken-keepers-health-armoury.75220/