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Bell System Practice 503-301-101 Issue 5 July 1982

 
4    Pages

Searchable  Format.

Bell System Practice 503-400-100 Issue 2 July 1982

 
8    Pages

Searchable  Format.

Bell System Practice 503-400-200 Issue 2 July 1982

 
4    Pages

Searchable  Format.

Bell System Practice 503-603-101 Issue 5 October 1980

 
56    Pages

Searchable  Format.