R4 (New York City Subway car) (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "R4 (New York City Subway car)" in English language version.

refsWebsite

Global rank English rank

1books.google.com

3^rd place

3^rd place

1web.archive.org

1^st place

1^st place

low place

low place

9^th place

13^th place

books.google.com

Cunningham, Joseph; DeHart, Leonard O. (1993). A History of the New York City Subway System. J. Schmidt, R. Giglio, and K. Lang.

erausa.org

"Archived copy" (PDF). Archived from the original (PDF) on 2021-04-27. Retrieved 2021-06-06.{{cite web}}: CS1 maint: archived copy as title (link)

web.archive.org

"Archived copy" (PDF). Archived from the original (PDF) on 2021-04-27. Retrieved 2021-06-06.{{cite web}}: CS1 maint: archived copy as title (link)

youtube.com

Karnes, A. E. "City of New York IND R4 #825 Test run". YouTube.