I'll also vote for catalpa. Outer bark looks right. Inner grain is whitish and looks to have catalpa wood's characteristic sheen when freshly split. Catalpa, form my experience, is not the easiest wood to split with a maul and will lose a lot of weight when dry. I have pics somewhere of of known catalpa firewood, searching my computer....
See the sheen in middle of top log in your picture:
See the sheen in middle of top log in your picture:
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