What should a land clearing contract include?

The scope with acreage and a marked map, density class assumed, tree-size cap in inches, exclusions (stumps, roots, haul-off), mobilization, deposit and payment terms, a utilities and property-line clause putting marking on the landowner, weather and ground-condition contingencies, and a cancellation fee once the machine is scheduled. One page of clear terms prevents the argument that costs you a week.