Archetypal wild man Edward Abbey and proper, dedicated Wallace Stegner left their footprints all over the western landscape. Now, in his book “All The Wild That Remains,” nature writer David Gessner follows the ghosts of these remarkable men from Stegner's birthplace in Saskatchewan to the site of Abbey's pilgrimages to Arches National Park in Utah, interweaving their stories and asking how they speak to the issues that confront the West today.