Construction and engineering.
| Fformat: | Llyfr | 
|---|---|
| Iaith: | English | 
| Cyhoeddwyd: | Philippines
          Asiaworld Publishing House, Inc.
    
        [1976] | 
| Pynciau: | 
| Fformat: | Llyfr | 
|---|---|
| Iaith: | English | 
| Cyhoeddwyd: | Philippines
          Asiaworld Publishing House, Inc.
    
        [1976] | 
| Pynciau: |