Amazon and other sources have in stock The Lost Notebooks of Loren Eiseley (University of Nebraska Press, 2002). Edited by Kenneth Heur with sketches by Leslie Morrill, Notebooks provides Eiseley readers with some of his ideas for an unfinished novel, preliminary notes on projects accomplished or abandoned, and insights not published elsewhere. Heur was Eiseley’s editor at Scribner’s, so presumably he’s an able filter for what’s worth reading.
Nebraska also publishes All the Strange Hours.