TY  - BOOK
AU  - Kells, Lyman M. 
TI  - Elementarry differential equations
U1  - 517.38 KEL  
PY  - 1954///.
CY  - New York : 
PB  - McGraw-Hill Book Company, Inc., 
KW  - Differential equations
KW  - Linear differential operators
KW  - Partial differential equations
N1  - Includes index.
ER  -