TY  - MANSCPT
AU  - Armstrong, William H. 
TI  - Study is hard work / 
U1  - 001 Ar5 
PY  - 1956///
CY  - s/l : 
PB  - Harper and Brothers Publishers, 
KW  - estudio-su valor
N1  - The purpose of this book is to help you to study more efficiently
ER  -