Source Data Reference for:
City = Boulogne
Time = 1900
| City | Year | Size | Size Comment | Year Comment | Author | Title | Location |
|---|---|---|---|---|---|---|---|
| Boulogne | 1900 | 49,000 | Tertius Chandler | Four thousand years of urban growth | p498 | ||
| Boulogne | 1901 | 49,900 | Jan Lahmeyer | http://www.populstat.info/ | n/a |