Title	Scale	Coverage	AreaCovered	Numbering	Contour
BC 20K	1:20000	British Columbia	6 x 12 min	092.G.034	20m
USGS 24/25K	1:24000	USA, except Alaska	7.5 x 7.5 min	47123-E4	20/40 foot
NTS 50K	1:50000	Canada, parts of Arctic	15 x 30 min.	092G15	100ft/20m
USGS 63K	1:63000	Alaska	1 x 3 (varies)	57132A1	100 ft
USGS 100K	1:100000	USA, except Alaska	30 x 60 min.		50m
NTS 250K	1:250000	Canada+Arctic	1 x 2 deg.	92J	500ft or 200m
USGS 250K	1:250000	USA + Alaska	1 x 2 deg	60141A1	200
NTS 500K	1:500000	Canada	2 x 4 deg	92 NE
USGS 500K	1:500000	USA	One State
BC 1:600000	1:600000	British Columbia	4 x 8 deg	None	None
NTS 1M	1:1000000	Canada and Arctic	4 x 6 deg.	NN10	250m
ONC	1:1000000	World	World	ONC-C9	1000 ft
USGS 1M	1:1000000	USA	4 x 6 deg	NN 9	Varies 300m, 500m
WAC	1:1000000	Canada	8 x 21 deg	WAC D-12	1000 ft
JNC	1:2000000	World		JNC43	1000
NTS 2M	1:2000000	Canada	All Canada	CTI-05	none
GNC	1:5000000	World	75-130	GNC 2	None
Alaska Base	1:10000000	Alaska