Fourth United Nations Regional Cartographic Conference for the Americas, New York, 23-27 January 1989.
United Nations Regional Cartographic Conference for the Americas(4th. :1989 :New York)
United Nations.Department for Technical Co-operation for Development.
New York : United Nations,
1989-
At head of title : Department for Technical Co-operation for Development
v. 1. Report of the conference -- v. 2. Technical papers.
Cartography