value of these deposits produces tremendous trade.

HORSES(PLAINS): Horses represent an increase in resources from
this area due to the benefits of using domesticated animals such
as the horse or oxen to do work. For all but the most recent
periods of history, animals were an important source of lifting
and pulling power.

OASIS(DESERT): The oasis is a very fertile island in the desert
that takes advantage of the presence of some water and rich
local nutrients. The result is an area that produces substantial
quantities of food.

OIL(SWAMP): Oil represents the presence of mineral wealth,
especially petroleum. The result is a substantial quantity of
resources. Oil resources cannot be improved by mining.

NOTE: If you convert terrain containing a special resource into
another terrain type, the original special resource is
lost. In some cases a special resource that can be found
in the new terrain may appear.


MINOR TRIBES
~~~~~~~~~~~~
During exploration, minor tribes may also be discovered in the
world. These are small tribes that have not yet advanced to be
civilizations. If you enter a minor tribe's village by moving onto it, a
number of things may happen. You may discover valuable metals, the tribe
may become a mercenary unit in your army, you may discover a scroll of
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