LANSING, Mich. (AP) — Michigan Gov. Rick Snyder has released 290,000 more pages of state emails and documents related to the lead-contaminated water in Flint.

The disclosure this week was the 10th and final mass-release of such records, which total nearly a half-million pages and have revealed his administration’s inner dialogue over the crisis.

The disaster began when the poverty-stricken city of nearly 100,000 residents left Detroit’s water system and started using improperly treated Flint River water in April 2014 while under state management.

The newly released material includes 9,000 pages of executive office records. It also has many duplicates from previous releases but also new ones. Snyder says they were made public to increase transparency and in response to public records requests, lawsuits and criminal investigations.