What is the author's style in Incident at Hawk's Hill by Allan W. Eckert?

One of the ways Eckert conveys character is through each individual's typical speech. The antagonist, George Burton uses many more colloquialisms and speaks in a much less educated manner than William MacDonald. The result is that Burton sounds ignorant and crude, while MacDonald sounds hardworking but kind. For example, a quotation in Chapter 4 on page 70 reads ""Ain't lost the ol' touch a'tall,' Burton said and then, turning, 'C'mon horse. You'n me's gonna go visitin'."