M61 Vulcan (Bulgarian Wikipedia)

Analysis of information sources in references of the Wikipedia article "M61 Vulcan" in Bulgarian language version.

refsWebsite

Global rank Bulgarian rank

1hathitrust.org

441^st place

1,705^th place

hathitrust.org

babel.hathitrust.org

Long Range Acquisition Estimates (FY 91 Base Year Projections). – Washington, D.C.: U.S. Government Printing Office, 1990. – P. 28 – 549 p.