Distribution of Values for
CORE COUNTRY DESIGNATION (COUNTRYDES)
| Code | Definition | Number of Accessions |
| A1 | Africa | 9 |
| A2 | Angola | 1 |
| A3 | Argentina | 1210 |
| A4 | Australia | 52 |
| B1 | Barbados | 1 |
| B2 | Benin | 2 |
| B3 | Bolivia | 570 |
| B4 | Brazil | 500 |
| B5 | Bulgaria | 7 |
| B6 | Burkina Faso | 81 |
| B7 | Burma | 4 |
| B8 | Burundi | 1 |
| C1 | Canada | 76 |
| C2 | Cameroon | 2 |
| C3 | Chad | 1 |
| C4 | Chile | 1 |
| C5 | China | 38 |
| C6 | China, People Repub. of | 209 |
| C7 | Colombia | 10 |
| C8 | Congo | 3 |
| C9 | Costa Rica | 3 |
| D1 | Dahomey | 2 |
| E1 | Ecuador | 104 |
| E2 | Egypt | 4 |
| E3 | El Salvador | 2 |
| E4 | Ethiopia | 3 |
| F1 | Fiji | 1 |
| F2 | France | 1 |
| F3 | French West Africa | 1 |
| G1 | Gambia | 3 |
| G2 | Ghana | 9 |
| G3 | Greece | 4 |
| G4 | Guinea | 27 |
| G5 | Guyana | 1 |
| H1 | Haiti | 2 |
| H2 | Honduras | 6 |
| H3 | Hungary | 12 |
| I1 | India | 468 |
| I2 | Indonesia | 9 |
| I3 | Iran | 3 |
| I4 | Israel | 428 |
| I5 | Italy | 3 |
| I6 | Ivory Coast | 20 |
| J1 | Jamaica | 13 |
| J2 | Japan | 100 |
| K1 | Kenya | 8 |
| K2 | Korea, Republic of | 4 |
| L1 | Liberia | 2 |
| L2 | Libya | 8 |
| M1 | Madagascar | 40 |
| M2 | Malaysia | 12 |
| M3 | Malawi | 109 |
| M4 | Mali | 31 |
| M5 | Martinique | 2 |
| M6 | Mauritius | 3 |
| M7 | Mexico | 46 |
| M8 | Morocco | 17 |
| M9 | Mozambique | 82 |
| N1 | Netherlands | 1 |
| N2 | Niger | 5 |
| N3 | Nigeria | 377 |
| P1 | Pakistan | 21 |
| P2 | Paraguay | 158 |
| P3 | Peru | 387 |
| P4 | Philippines | 12 |
| P5 | Portugal | 30 |
| P6 | Puerto Rico | 2 |
| R1 | Rhodesia | 3 |
| S1 | Senegal | 107 |
| S2 | Sierra Leone | 4 |
| S3 | South Africa | 196 |
| S4 | Soviet Union | 31 |
| S5 | Somalia | 1 |
| S6 | Somaliland | 2 |
| S7 | Spain | 10 |
| S8 | Sudan | 221 |
| S9 | Surinam | 4 |
| T1 | Taiwan | 88 |
| T2 | Tanzania | 28 |
| T3 | Thailand | 44 |
| T4 | Togo | 22 |
| T5 | Trinidad and Tobago | 1 |
| T6 | Turkey | 5 |
| U1 | Uganda | 43 |
| U3 | Unknown | 11 |
| U4 | United States | 14 |
| U5 | Uruguay | 54 |
| V1 | Venezuela | 41 |
| V2 | Vietnam | 24 |
| W1 | West Africa | 1 |
| Z1 | Zaire | 19 |
| Z2 | Zambia | 633 |
| Z3 | Zimbabwe | 444 |