TY  - SER
AU  -  Berthold, Victor Maximilian, 
TI  -  The Die Varieties of the Nesbitt Series of United States Envelopes 
AV  - HE 
PY  - 2012///
PB  -  Project Gutenberg, 
KW  -  Postage stamps -- United States
N1  -  Public domain in the USA;  Text
UR  -  http://www.gutenberg.org/ebooks/40002
ER  -