Christian missions and social progress : a sociological study of foreign missions (vol. 1)

http://www.archive.org/details/socialprogress00dennuoft/

Christian missions and social progress : a sociological study of foreign missions (vol. 3)

http://www.archive.org/details/socialprogress03dennuoft/

Christian missions and social progress : a sociological study of foreign missions (vol. 2)

http://www.archive.org/details/socialprogress02dennuoft/