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Bell System Practice 500-130-180 Issue 2 August 1964

 
1    Pages

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Bell System Practice 500-150-100 Issue 1 February 1967

 
11    Pages

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Bell System Practice 500-150-100 Issue 7 January 1974

 
7    Pages

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Bell System Practice 500-155-100 Issue 2 December 1961

 
3    Pages

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Bell System Practice 500-810-200 Issue 1 July 1961

 
4   Pages

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Bell System Practice 500-815-200 Issue 1 September 1966

 
3    Pages

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Bell System Practice 500-820-200 Issue 1 July 1961

 
2    Pages

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Bell System Practice 500-820-201 Issue 1 July 1961

 
2    Pages

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Bell System Practice 500-820-203 Issue 1 July 1961

 
2    Pages

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Bell System Practice 500-820-205 Issue 1 December 1962

 
2    Pages

Searchable  Format.