| Country | Action | Action Date | Effective Date |
|---|
| BRAZIL | Signature | 13/12/1937 | |
| CANADA | Signature | 13/12/1937 | |
| CANADA | Approval | 22/12/1938 | |
| CHILE | Signature | 13/12/1937 | |
| CHILE | Approval | 03/11/1938 | |
| COLOMBIA | Signature | 13/12/1937 | |
| CUBA | Signature | 13/12/1937 | |
| DOMINICAN REPUBLIC | Signature | 13/12/1937 | |
| GUATEMALA | Signature | 13/12/1937 | |
| HAYTI | Signature | 13/12/1937 | |
| HAYTI | Approval | 27/06/1938 | |
| MEXICO | Signature | 13/12/1937 | |
| MEXICO | Ratification | 17/04/1939 | |
| NICARAGUA | Signature | 13/12/1937 | |
| PANAMA | Signature | 13/12/1937 | |
| PANAMA | Approval | 26/01/1939 | |
| PERU | Signature | 13/12/1937 | |
| PERU | Approval | 25/07/1938 | |
| UNITED KINGDOM | | | |
| UNITED STATES OF AMERICA | Signature | 13/12/1937 | |
| UNITED STATES OF AMERICA | Approval | 18/07/1938 | |
| URUGUAY | Signature | 13/12/1937 | |
| VENEZUELA | Signature | 13/12/1937 | |