Digging bar (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Digging bar" in English language version.

refsWebsite

Global rank English rank

1books.google.com

3^rd place

3^rd place

books.google.com (Global: 3^rd place; English: 3^rd place)

Annual Report of the Commissioner of Patents, Part 2; Part 4. US Patent office. 1858. p. 291.