33 TERRAIN TYPES
Note that improvement (e.g. Engineering) preserves "Super" category except
for Grassland, whose shield status seems to be independent of super-status
of transformed lands. Roads always cost 1/3 move to traverse.

Base: 		Plains	Grass	Forest	Hills	Mountai	Tundra	Glacier
Food		1	2	1	1	0	1	0	
Shield		1	0	2	0	1	0	0
Trade		0	0	0	0	0	0	0

Super1:		Buffalo	w/shld	Pheasan	Coal	Gold	Game	Ivory
Food		1	2	3	1	0	3	1
Shield		3	1	2	2	1	1	1
Trade		0	0	0	0	6	0	4

Super2:		Wheat		Silk	Wine	Iron	Furs	Glac.Oil
Food		3		1	1	0	2	0
Shield		1		2	0	4	0	4
Trade		0		3	4	0	3	0

Move Cost	1	1	2	2	3	1	2
Defense Bonus	0	0	+50%	+100%	+200%	0	0
Irrig: yields	1food	1food	Plains	1food	1food	1food	X
 takes(turns)	5	5	5	10	10	10	X
Mining: yield	Forest	Forest	Mine	3shield	1shield	X	1shield
 takes(turns)	15	10	5	10	10	X	15
Eng'g: yields	Grass	Hills	Grass	Plains	Hills	Desert	Tundra
Road bonus:	1trade	1trade	0	0	0	0	0

Base: 		Swamp	Jungle	Ocean	Desert
Food		1	1	1	0
Shield		0	0	0	1
Trade		0	0	2	0

Super1:		Peat	Gem	Fish	Oasis
Food		1	1	3	3
Shield		4	0	0	1
Trade		0	4	2	0

Super2:		Spice	Fruit	Whale	Des.Oil
Food		3	4	2	0
Shield		0	0	2	4
Trade		4	1	3	0

Move Cost	2	2	2	1
Defense Bonus	+50%	+50%	0	0
Irrig: yields	Grass	Grass	X	1food
 takes(turns)	15	15	X	5
Mining: yield	Forest	Forest	X	1shield
 takes(turns)	15	15	X	5
Eng'g: yields	Plains	Plains	X	Plains
Road bonus:	0	0	X	1trade

Special Terrain Features: Each square can also carry flags of
	Irrig	Mining	Road	Rail	Fortres	Airbase	Pollution
(Irrigation+Mining = Farmland)