404 BELL SYSTEM TECHNICAL JOURNAL 



2. "Telephone System of the United States," Bancroft Gherardi and F. B. Jewett, 



Bell Sys. Tech. Jour., January, 1930. 



3. "Telephone Toll Plant in the Chicago Region," Burke Smith and G. B. West, 



Jour. A. L E. E., January, 1928. 



4. "Telephone Trunking Plant in a Metropolitan Area," A. P. Godsho, presented at 



District Meeting of the American Institute of Electrical Engineers, Phila- 

 delphia, Pa. October, 1930. 



5. "The Call Announcer," W. H. Matthies, Bell Laboratories Record, December, 



1929. 



6. "Evolution of the Call-Indicator Svstem," E. H. Clark, Bell Laboratories Record, 



December, 1929. 



7. "The Manual Tandem Board," C. G. Spencer, Bell Laboratories Record, De- 



cember, 1929. 



8. "Toll Tandem Switchboard," C. E. Hokanson, Bell Laboratories Record, 



June, 1930. 



9. "Key Display Type Call Indicators," S. T. Curran, Bell Laboratories Record, 



July, 1930. 



10. "The Telephone Problem in the World's Largest Metropolitan Area," Kirkland 



A. Wilson, Bell Tel. Quart., October, 1934. 



11. "Dial Switching of Connecticut Toll Calls," W. F. Robb, .\. \L Millard, and 



G. M. McPhee, Electrical Engineering, July, 1936. 



