From Preface: "The purpose of such publication is to point out the laws and regulations best adapted to increase safety and efficiency in the mineral industry of the United States and to aid legislative bodies in framing uniform mining laws. The State of California, by reason of its historic interest in mining and by reason of its great extent of mineral land and its vast mineral deposits, has been selected for the first bulletin of the of the State series. This bulletin is submitted to the miners and operators and all persons interested in the mining exterprises in California and in those of other States in the hope that it will be accorded the same generous reception as was given Bulletin 94."

Discusses distribution,sexual and age differences, specimens, and classification of North American grizzly and big brown bears. Describes and lists locations of species and subspecies. Mentions Vetularctos, a new genus related to Ursus.