| Office Machines |
FEI 200 |
| Office Offset Printing |
FEI 970 |
| Office Organisation |
WIR 555 |
| Office Technology |
FEI 200 |
| Office, Electronic Data Processing |
DAT 850 |
| Offices, Reinforced Concrete |
BAU 432 |
| Official Regulations |
JUR 040 |
| Offset Printing |
IND 949 |
| Offshore Basins |
BAU 575 |
| Offshore Drilling |
BER 670 |
| Offshore Technology |
VER 315 |
| Offshore Terminals |
BAU 575 |
| OHG |
JUR 117 |
| Oil Burners |
ERG 463 |
| Oil Crops |
LAN 359 |
| Oil Firing |
ERG 463 |
| Oil Fruits, Processing |
LEB 290 |
| Oil Gas |
ERG 285 |
| Oil Geology |
GEO 326 |
| Oil Hydraulics |
MAS 680 |
| Oil Shale, Geology |
GEO 326 |
| Oil-Fired Power Plants |
ERG 650 |
| Oil, Pollutants |
UMW 196 |
| Oils, Food Chemistry |
CHE 533 |
| Oilseed, Processing |
LEB 290 |
| Old Age, Sociology |
SOZ 345 |
| Old Church (up to about 100 A.d.) |
REL 770 |
| Old Testament |
REL 630 |
| Oliosaccharides |
CHE 850 |
| Olympic Games |
SPO 545 |
| Olympic Movement |
SPO 546 |
| On-Board Computers, Motor Vehicles |
VER 085 |
| On-Board Power Networks |
ELT 914 |
| Oncology |
MED 321 |
| One-Dimensional Conductors |
PHY 677 |
| Online Catalogues |
INF 415 |
| Onomastics, Geographical |
GEO 013 |
| Ontogeny |
BIO 186 |
| Ontogeny, Botany |
BIO 456 |
| Ontogeny, Zoology |
BIO 756 |
| Ontologies |
DAT 703 |
| Oomycetes |
BIO 521 |
| Opac |
INF 415 |
| Open Channels, Hydraulic Calculation |
UMW 418 |
| Open Forest Stands, Treatment |
FOR 250 |
| Open Spaces, Ancient Greece |
ARC 854 |
| Open Water Surface, Unsteady Flow |
BAU 697 |
| Open-Channel Flow |
MTA 340 |
| Open-Loop Control Technology |
MSR 605 |
| Openings, Effluent |
BAU 685 |