Digging and Pouring 35 Footers for a Big Shed

I am building a 20x30 shop and its time to dig and pour the footers. I am installing 35 concrete footers for my new shop. I use string line and batter boards to keep my rows straight. On top of the footers I am using a 4x8x16 cap block so that is the size footers I am digging.
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