Abbot, Lon books & textbook
Geology Underfoot Along Colorado's Front Range
Mountain Press /2012-12-01 Paperback / 338 Pages
isbn-10: 0878425950 / isbn-13: 9780878425952
Geology Underfoot in Northern Arizona (Geology Underfoot, 6)
Mountain Press /2007-05-15 Paperback / 321 Pages
isbn-10: 0878425284 / isbn-13: 9780878425280
