I couldn't find anything specific to the 24th Militia, but maybe this would help.
Joe Brown's Pets: The Georgia Militia, 1861-1865
Description
Using original documents found in the Georgia Department of Archives and History, two Civil War historians have written not only the first history of the Georgia Militia during the Civil War, but have produced the definitive history of this militia.
I found this on Amazon, they are asking $42.61 for the hardcover.