LANSING, Mich. (AP) – Michigan Gov. Rick Snyder has released some – but not all – of his government emails related to Flint’s water emergency.

The 274 pages cover 2014 and 2015. That includes the 18-month period during which the city switched its water source while under state financial management until it reconnected to Detroit’s system because of lead contamination blamed on state regulatory failures.

Snyder has withheld the emails of others in the executive office along with his own emails from earlier.

Michigan is one of two states that wholly exempt the governor’s office from public-records requests.

Snyder calls the release of his emails unprecedented. Democrats and open-government advocates say he should release more since emergency managers he appointed to run Flint were involved in the decision to switch the water.