I stack mine in rows ( 30 ft ) and cover them with rubber roofing. I label each row by writing ( with a permanent marker ) on a small piece of metal flashing with the date and type of wood and nail it to stack. No mistaking on what kind of wood I'm burning and how old it is. My worst nightmare would be straight lined winds come through and push them all over mixing my wood.
You must have entered your post as I was typing...basically what we do. I also label the type of wood and date stacked or I would neve be sure of what is what!