TY  - BOOK
AU  - Walton,W.B.
AU  - Howard,G.H.
AU  - Johnson,B.
TI  - German standard problem 4a
U1  -  658.51062 
PY  - 1981///
CY  - Washington, D.C.
PB  - U.S. Government Printing Office
KW  - Standards, Engineering
KW  - Standardization
ER  -