TY  - SER
AU  -  Sumner, William Graham, 
TI  -  What Social Classes Owe to Each Other 
AV  - HN 
PY  - 2006///
PB  -  Project Gutenberg, 
KW  -  Social ethics
KW  -  Economics
N1  -  Public domain in the USA;  Text
UR  -  http://www.gutenberg.org/ebooks/18603
ER  -