| Type | Book |
| Title | Fifteenth Census of the United States, 1930: Agriculture |
| Author(s) | |
| Volume | 4 |
| Publication (Day/Month/Year) | 1931 |
| Publisher | US Government Printing Office |
| URL | https://books.google.fr/books?hl=fr&lr=&id=-p9iVQltF1EC&oi=fnd&pg=PA9&ots=Q25M9BpgkC&sig=nFrmZr2ksbf7GU0SYPVro7s6Uis#v=onepage&q&f=false |