A critical era in California's history and development--the building of the first roads over the Sierra Nevada--is thoroughly and colorfully documented in Thomas Howard's fascinating book. During California's first two decades of statehood (1850-1870), the state was separated from the east coast by a sea journey of at least six weeks. Although Californians expected to be connected with the other states by railroad soon after the 1849 Gold Rush, almost twenty years elapsed before this occurred. Meanwhile, various overland road ventures were launched by "emigrants," former gold miners, state...