Systematic work simplification .
Wedi'i Gadw mewn:
| OCLC: | 16635366 |
|---|---|
| Prif Awdur: | |
| Iaith: | English |
| Cyhoeddwyd: |
Printed in U.S.A.,
the author,
c1960.
|
| Fformat: | Monograph Note that CRL will digitize material from the collection when copyright allows. |