- Publication venue
- New York : The Century Co.,
- Publication date
- Field of study
No full textIncludes bibliographical references (pages [407]-420) and index.Mode of access: Internet
- Publication venue
- New York : The Century co.,
- Publication date
- Field of study
No full textMode of access: Internet
- Publication venue
- [New York, Rockefeller Foundation,
- Publication date
- Field of study
No full textMode of access: Internet