The Norman Maclean Reader is a year out, but I've just read it. Hasn't fully been absorbed, but I recommend it for its sketches of Luce and Utley and Custerland before Little Big Man and the slap down of the Gay Cavalier. It contains five chapters of a book he chose not to pursue.
Maclean wrote a River Runs Through It and Young Men and Fire, and as an English professor he was engaged somewhere between Custer and the Epic of Defeat and King Lear and placing the LBH in a literary template. All of which excites me way beyond the battle or Custer himself.
He's one of the best writers in English, and although this is not his best work it's elevated WAY above most Custer related garbage.
".. all experience hath shewn, that mankind are more disposed to suffer, while evils are sufferable, than to right themselves by abolishing the forms to which they are accustomed...." T.Jefferson, Declaration of Independence