Area codes 909 and 840 (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Area codes 909 and 840" in English language version.

refsWebsite

Global rank English rank

3nationalnanpa.com

2,470^th place

1,321^st place

6^th place

6^th place

archive.org

Mabbs, Ralph (Winter 1947–1948). "Nation-Wide Operator Toll Dialing—the Coming Way". Bell Telephone Magazine. 26 (4): 181. Retrieved 2023-07-01.

nationalnanpa.com

"NANP- Split of 909 Numbering Plan Area (NPA) with 951 NPA – and subsequent Overlay of 909 Numbering Plan Area (NPA) with 752 NPA - California" (PDF). NANPA. 1999-08-26. Retrieved 2023-07-29.
"Planning Letter 334: 909 NPA; 2-way Split, Creating 951 NPA – California" (PDF). NANPA. 2003-12-12. Retrieved 2023-07-29.
"NANPA Planning Letter 529" (PDF). 2019-07-23.