Colophon
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This eBook is produced by the Online Distributed Proofreading Team at www.pgdp.net.
Scans for this book are available from the Internet Archive (copy 1).
Library of Congress Classification: UB290 .H5.
Related Library of Congress catalog page: war16000058.
Related Open Library catalog page (for source): OL7044123M.
Related Open Library catalog page (for work): OL92027W.
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Library of Congress Classification
Revision History
2011-12-15 Started.
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Corrections
The following corrections have been applied to the text:
Page Source Correction
1 messages message
17 [Not in source] ,
22 begining beginning
27 b d
28 of or
37 Kirckhoff’s Kerckhoffs’
44 preceeding preceding
49 WE We
51 identfied identified
63 [Not in source] .
66 [Not in source] )
67 0 2
67 [Not in source] 1
89 . :
98 . . . . . . . - . - . -
98 . - . - . - - - . . - -