Report presenting a study of stoping methods and costs and summarizing the data obtained in earlier publications and those obtained during investigations in the field that apply particularly to stoping.

From introduction: "In this paper are assembled and summarized many subjects relating to the copper industry in North America. Production of mines and districts, history of the industry in North America. Production of mines and districts, history of the industry, geology, of the principal deposits, and mining methods and costs are discussed."

Volume provides abstracts of agricultural experiments conducted during the year. Also includes statistics, convention reports, bulletins, bibliographies, and listings for Spanish edition publications from the Porto Rico Station. Name and subject indexes start on page 901.

A topical, alphabetically arranged index to volumes 41-50 including experiment station records, publications reviewed, and foreign publications. In has a list of all editorial notes from the referenced volumes.

Introduction Object and Scope of Paper: "This paper attempts to assemble and discuss briefly in one volume a number of subjects relating to the mining of gold, particularly from lode deposits, in the United States and Canada."

A topical, alphabetically arranged index to volumes 61-70 including experiment station records, publications reviewed, and foreign publications. In has a list of all editorial notes from the referenced volumes.