Columbia subject headings:
Dominican Republic--Boundaries--Haiti.
Dominican Republic--Relations--Haiti.
Haiti--Boundaries--Dominican Republic.
Haiti--Relations--Dominican Republic.
Harvard subject headings:
Dominican Republic--Boundaries--Haiti.
Dominican Republic--Environmental conditions.
Dominican Republic--Relations--Haiti.
Environmental protection.
Haiti--Boundaries--Dominican Republic
Haiti--Environmental conditions.
Haiti--Relations--Dominican Republic.
Princeton subject headings:
Dominican Republic--Boundaries--Haiti.
Dominican Republic--Relations--Haiti.
Haiti--Boundaries--Dominican Republic.
Haiti--Relations--Dominican Republic.