El Salvador; official standard names approved by the United States Board on Geographic Names.

APA Citation

United States. Office of Geography. (1956). El Salvador; official standard names approved by the United States Board on Geographic Names. Washington.

MLA Citation

United States. Office of Geography. El Salvador; Official Standard Names Approved by the United States Board On Geographic Names. Washington, 1956.

Warning: These citations may not always be complete (especially for serials).