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Wyoming follows the common law of property with regards XXXXX XXXXX trees on neighboring property. Under common law, if a neighbor's tree overhangs your property, you have the legal right to remove or trim all overhanging branches as long as you do so without damaging his trees.
If you can prove the entire tree is dead and that it causes a danger, then you can sue him for "nuisance" and ask the court to abate the nuisance by ordering the removal of the trees.
I suggest the first thing you do is properly remove any branches overhanging your property or use a professional to do so. If that will not resolve the problem, then you would need a general litigation or a real estate law attorney locally to file suit for nuisance to ask for the court to order the removal of the trees and you can find a local attorney at the same sites used by other attorneys, http://www.martindale.com or http://www.lexmundi.com or http://www.hg.org
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