![[William Wheeler Hubbell, authorized to apply for patents.]](https://covers.openlibrary.org/b/id/10200621-M.jpg)
United States. Congress. Senate. Committee on Patents
Kokuritsu Kokkai Toshokan (Japan)
United States. General Accounting Office
Ofsted.
United States. Bureau of the Census
Gansu Sheng di fang shi zhi bian zuan wei yuan hui
