by Tilo Pfeifer
![[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. Bureau of the Census
Shanben Chen
Beijing Shi di fang zhi bian zuan wei yuan hui
United States. General Accounting Office. RCED
