Halper, Jon, ed., Gary Snyder: Dimensions of a Life, Sierra Club Books, 1991.

This book was published in honor of Snyder's sixtieth
birthday; it is a collection of affectionate and
appreciative essays written by Snyder's friends and
colleagues. It covers varying aspects of Snyder's life
and work.

Molesworth, Charles, Gary Snyder's Vision: Poetry and the Real Work, University of Missouri Press, 1983.

This scholarly study, hampered by the lack of an index,
emphasizes Snyder's political concerns, showing
how he responds to and corrects the values of multinational
capitalism. It was published before Axe Handles
and so includes no discussion of that volume.

Snyder, Gary, The Practice of the Wild, North Point Press, 1990.

This is a collection of nine essays that describe Snyder's
many journeys into nature, both literal and metaphorical,
and his thoughts on the interaction of nature and culture.

Steuding, Bob, Gary Snyder, Twayne's United States Authors...