That is an amazing job of packaging books!
FYI - I am working on putting together a Wish List of vehicles for the Korean War, and the M7B2 Priest served there. Except for the Brits and their Centurion (which apparently could climb steep hills like a mountain goat), the allies preferred chassis was the M4A3 Sherman. Could handle fields and crappy roads with ease, and didn't bog down nearly as often asn the much heavier Pershing and Patton. About half the armor that served in Korea were Shermans.
And while the standard M7 Priest was based off the Grant/Lee, the M7B2 was a redesign based off the M4A3 Sherman chassis. So it was well loved by the infantry, who were happy to get mobile artillery supporting them under crappy conditions. The M7B2 Priest could go places other self-propelled artillery could not.