Original North American area codes (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Original North American area codes" in English language version.

refsWebsite

Global rank English rank

11archive.org

6^th place

4worldradiohistory.com

316^th place

190^th place

3doi.org

2^nd place

2semanticscholar.org

11^th place

8^th place

1historyofphonephreaking.org

low place

1american.edu

5,076^th place

3,404^th place

1census.gov

45^th place

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1web.archive.org

1^st place

1att.com

6,123^rd place

4,716^th place

american.edu

Erickson, Andrew (March 2021). "New In Town". American University Magazine. Retrieved January 7, 2022. (NANPA] relies on a tried-and-true methodology that considers factors like customer confusion.

archive.org

Osborne, H.S. (July 1930). "A General Switching Plan for Telephone Toll Service". The Bell System Technical Journal. 9 (3): 429–447.
Hosford, Howard L. (Winter 1943). "A Dial Switching System for Toll Calls". Bell Telephone Magazine. 22 (4): 230. Retrieved 2022-04-23.
Pilliod, James J.; Ryan, Harold L. (Summer 1945). "Operator Toll Dialing—A New Long Distance Method". Bell Telephone Magazine. 24 (2): 101–115. Retrieved 2022-01-02.
Mabbs, Ralph (Winter 1947–1948). "Nation-Wide Operator Toll Dialing—the Coming Way". Bell Telephone Magazine. 26 (4): 181. Retrieved 2022-04-23.
AT&T, Department of Operation and Engineering (1955). Notes on Nationwide Dialing (Report). American Telephone and Telegraph Company. p. 133.
Nunn, W.H. (1952). "Nationwide Numbering Plan". The Bell System Technical Journal. 31 (5): 851.
Keevers, R. J. (1975-12-12). "North American Numbering Plan–The First Thirty Years". Bell Laboratories Memorandum No. 40978.
Guengerich, E. J. (Winter 1948). "Toll Dialing by Operators Reaches Some 300 Places". Bell Telephone Magazine. 27 (4): 228–237. Retrieved 2022-01-20.
Baker, Ernest W. (Winter 1951). "Toll Dialing Is Expanding Throughout the Nation". Bell Telephone Magazine. 30 (4): 253. Retrieved 2022-01-20.
Nunn, W.H. (1952). "Nationwide Numbering Plan". The Bell System Technical Journal. 31 (5): 959. doi:10.1002/j.1538-7305.1952.tb01412.x. Retrieved 2022-01-20.
Sinks, William A. (Winter 1959). "New Numbers for Tomorrow's Telephones". Bell Telephone Magazine. 38: 6–15.

att.com

corp.att.com

AT&T Corporation. "1951: First Direct-Dial Transcontinental Telephone Call". Archived from the original on 2007-01-07. Retrieved 2020-08-25.

census.gov

"Historical Population Density Data (1910–2020)". United States Census Bureau. 2021-04-26. Retrieved 2022-01-12.

doi.org

Clark, A. B.; Osborne, H. S. (1952). "Automatic Switching for Nationwide Telephone Service". The Bell System Technical Journal. 31 (5): 823. doi:10.1002/j.1538-7305.1952.tb01410.x. S2CID 51639224.
Korn, F.A.; Ferguson, James G. (1950). "Number 5 Crossbar Dial Telephone Switching System". AIEE Transactions. 69 (1): 244–254. doi:10.1109/T-AIEE.1950.5060147. S2CID 51637587. The Number 5 Crossbar System ... can be used for as few as four digits in a subscriber number, or as many as 11 digits may be used to code the called subscriber completely. (abstract)
Nunn, W.H. (1952). "Nationwide Numbering Plan". The Bell System Technical Journal. 31 (5): 959. doi:10.1002/j.1538-7305.1952.tb01412.x. Retrieved 2022-01-20.

historyofphonephreaking.org

Norris, F.E.; USITA (Chairman) (1946-01-12). "Nationwide Operator Toll Dialing" (PDF). Telephony. 130 (2): 13.

semanticscholar.org

api.semanticscholar.org

Clark, A. B.; Osborne, H. S. (1952). "Automatic Switching for Nationwide Telephone Service". The Bell System Technical Journal. 31 (5): 823. doi:10.1002/j.1538-7305.1952.tb01410.x. S2CID 51639224.
Korn, F.A.; Ferguson, James G. (1950). "Number 5 Crossbar Dial Telephone Switching System". AIEE Transactions. 69 (1): 244–254. doi:10.1109/T-AIEE.1950.5060147. S2CID 51637587. The Number 5 Crossbar System ... can be used for as few as four digits in a subscriber number, or as many as 11 digits may be used to code the called subscriber completely. (abstract)

web.archive.org

AT&T Corporation. "1951: First Direct-Dial Transcontinental Telephone Call". Archived from the original on 2007-01-07. Retrieved 2020-08-25.

worldradiohistory.com

Shipley, F. F. (October 1945). "Nation-Wide Dialing" (PDF). Bell Laboratories Record (10): 368–372. Retrieved 2022-10-13.
"Nation-Wide Toll Dialing Makes Its Bow" (PDF). Bell Laboratories Record. 27 (2): 71–72. February 1949. Retrieved 2022-01-20.
Moody, D. L. (December 1945). "Multi-Frequency Pulsing" (PDF). Bell Laboratories Record. 23 (12): 466–470. Retrieved 2022-01-20.
"Nation-Wide System for Toll-Line Dialing" (PDF). Bell Laboratories Record. 27 (1): 29. January 1949. Retrieved 2022-01-20.