The "*.Map/*.cbd" files encode features from the "CIA World Data Bank II
map database".

The CIA World Bank II master information is a series of COBOL records, 
specifying 5,719,617 individual vectors, which occupies about 130
megabytes of disk space. The "cbd" files here are compressed binary
encodings of it, collectively occupying about 15 megabytes of disk space.
These "cbd" files were produced from the original ASCII database by
Brian Reid at Decwrl.

The original database is available from the U.S. Government and is in the
public domain. The map database is divided into continents (North America,
South America, Europe, Africa, and Asia), and within continents it is
divided into "Coastlines, Islands, and Lakes" (cil files), "Rivers"
(riv files), "International political boundaries" (bdy files) and
"National political boundaries" (pby files). Each file is divided into
several thousand "segments", and each segment is divided into some number
of "strokes". The .cbd encoding of the database encodes each continent into
a directory and each division into a file.

The "rank" of segments within a file is an indication of what the segment
depicts:

In "Boundary" files (bdy):
	01	Demarcated or delimited boundary
	02	Indefinite or in Dispute
	03	Other line of separation of sovreignty on land

In "Coast, Islands and Lakes" files (cil)
	01	Coast, islands and lakes that appear on all maps
	02	Additional major islands and lakes
	03	Intermediate islands and lakes
	04	Minor islands and lakes
	06	Intermittent major lakes
	07	Intermittent minor lakes
	08	Reefs
	09	Salt pans -- major
	10	Salt pans -- minor
	13	Ice Shelves -- major
	14	Ice Shelves -- minor
	15	Glaciers

In "Rivers" files (riv)
	01	Permanent major rivers
	02	Additional major rivers
	03	Additional rivers
	04	Minor rivers
	05	Double lined rivers
	06	Intermittent rivers -- major
	07	Intermittent rivers -- additional
	08	Intermittent rivers -- minor
	10	Major canals
	11	Canals of lesser importance
	12	Canals -- irrigation type

Wrangell Island, off the coast of Siberia, seems to have been damaged
by a bug in the data compaction program.
