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t-rex vs albertosaurus question

Hi, I received a question from Bruce that I can not answer for him. He
is trying to determine if a tooth he has is a t-rex or albertosaurus.  I
looked in my books and could not give hom a clear cut answer. The
examples I saw in Gluts book appeared to show the t-rex as less broad
but this could just be the sample. Thanks, Ron(:)