Robert Pyle Quotes

Robert Michael Pyle, Roger Tory Peterson Institute (1992). “Handbook for Butterfly Watchers”, p.93, Houghton Mifflin Harcourt
Robert Michael Pyle (2007). “Sky Time in Gray's River: Living for Keeps in a Forgotten Place”, p.204, Houghton Mifflin Harcourt
Robert Michael Pyle (1986). “Wintergreen: Rambles in a Ravaged Land”, Scribner