sand, or
gravel surfaces), but must be usable. Not all airports have facilities
for refueling, maintenance, or air traffic control.

Airports - with paved runways
This entry gives the total number of airports with paved runways
(concrete or asphalt surfaces) by length. For airports with more than
one runway, only the longest runway is included according to the
following five groups - (1) over 3,047 m, (2) 2,438 to 3,047 m, (3)
1,524 to 2,437 m, (4) 914 to 1,523 m, and (5) under 914 m. Only
airports with usable runways are included in this listing. Not all
airports have facilities for refueling, maintenance, or air traffic
control.

Airports - with unpaved runways
This entry gives the total number of airports with unpaved runways
(grass, dirt, sand, or gravel surfaces) by length. For airports with
more than one runway, only the longest runway is included according to
the following five groups - (1) over 3,047 m, (2) 2,438 to 3,047 m, (3)
1,524 to 2,437 m, (4) 914 to 1,523 m, and (5) under 914 m. Only
airports with usable runways are included in this listing. Not all
airports have facilities for refueling, maintenance, or air traffic
control

Appendixes
This section includes Factbook-related material by topic.

Area
This entry includes three subfields. Total area is the sum of all land
and water areas delimited by international boundaries and/or
coastlines. Land area is the aggregate of all surfaces delimited by
international boundaries and/or coastlines, excluding inland water
bodies (lakes, reservoirs, rivers). Water area is the sum of all water
surfaces delimited by international boundaries and/or coastlines,
including inland water bodies (lakes, reservoirs, rivers).

Area - comparative
This entry provides an area comparison based on total area equivalents.
Most entities are compared with the entire US or one of the 50 states
based on area measurements (1990 revised) provided by the US Bureau of
the Census. The smaller entities are compared with Washington, DC (178
sq km, 69 sq mi) or The Mall in Washington, DC (0.59 sq km, 0.23 sq mi,
146 acres).

Background
This entry usually highlights major historic events and current issues
and may include a statement about one or two key future trends.

Birth rate
This entry gives the average annual number of births during a year per
1,000 persons in the population at midyear; also known as crude birth
rate. The birth rate is usually the dominant factor in determini