| D |
General Works. |
| DA |
Great Britain. |
| DB |
Austria. Hungary. Czechoslovakia. |
| DC |
France. |
| DD |
Germany. |
| DE |
Mediterranean Region. Classical World. |
| DF |
Greece, ancient & modern. |
| DG |
Italy. Ancient Rome. |
| DH |
Low Countries: Belgium, Luxembourg. |
| DJ |
Netherlands (Holland). |
| DJK |
Central Europe. |
| DK |
Russia. Soviet Union. Poland. |
| DL |
Northern Europe. Scandinavia. |
| DP |
Spain. Portugal. |
| DQ |
Switzerland. |
| DR |
Balkan Peninsula. Turkey. |
| DS |
Asia. |
| DT |
Africa. |
| DU |
South Seas Islands. Australia. New Zealand. |
| DX |
Gypsies. |
