1
Published: 1928
Superior document: Reprint / Bell Telephone Laboratories B-295
2
Published: 1927
Superior document: Reprint / Bell Telephone Laboratories B-256
3
Published: 1930
Superior document: Bell telephone system B-493
4
Published: 1894
5
Published: 1903
6
Published: c1999.
Superior document: Biological techniques
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