'The Church on the Changing Frontier' is a published study on the work of Protestant city, town and country churches in four counties on the Range. It discusses the effect on the Church of the changing conditions in the Rocky Mountain States, and the task of the Church in ministering to the situation which existed in its day. The four counties studied in the book are Beaverhead in Montana, Sheridan in Wyoming, Union in New Mexico and Hughes in South Dakota. In the spring of 1921 the field worker, Miss Helen Belknap, of the Committee on Social and Religious Surveys, visited these counties, verified the results of the survey work previously done, and secured additional information not included in the original study. This book is the result of that work.