The Lolo Trail


Book Description

A thorough history of the Indian trail taken by Lewis & Clark from the headwaters of the Clearwater River to the Columbia, which later became a trail to the gold fields of Montana.







Directory, Forest Service


Book Description




Skarns in British Columbia


Book Description

Skarns in British Columbia have historically been important sources of iron, tungsten, copper, and gold. This publication begins with an introduction on skarn terminology and the problems of skarn identification. It then reviews a genetic model of skarn formation and presents descriptive profiles of eight types of skarn deposits; describes the database of at least 735 skarn occurrences in the province, and the number and distribution of skarns in British Columbia according to their associations, class, age, and distribution; and notes the ages of British Columbia skarns and the total production of various metals extracted from British Columbia skarns. Subsequent sections provide information on assays and metal ratios of mineralized skarns, skarn mineralogy, skarn mineral chemistry, chemistry of skarn-related intrusions, and the mapping and evaluation of skarns. The appendix contains a listing of 735 skarn occurrences in British Columbia, giving deposit name, MINFILE number, latitude/longitude, elements and minerals present, and associated rocks and their ages.










Think Like a Mountain


Book Description

In twenty short books, Penguin brings you the classics of the environmental movement. In this lyrical meditation on America's wildlands, Aldo Leopold considers the different ways humans shape the natural landscape, and describes for the first time the far-reaching phenomenon now known as 'trophic cascades'. Over the past 75 years, a new canon has emerged. As life on Earth has become irrevocably altered by humans, visionary thinkers around the world have raised their voices to defend the planet, and affirm our place at the heart of its restoration. Their words have endured through the decades, becoming the classics of a movement. Together, these books show the richness of environmental thought, and point the way to a fairer, saner, greener world.