No	Name	Flown By	Date Flown	Spacing	Dir	Altitude	LnMi	Datum	Publication
3046	Northeast North Carolina	GeoMet.	10/74-11/74	1 mi.	E-W	500 AG	5150	IGRF65, varied	OF76-181
3070	North-central N.C.	GeoMet.	10/75-12/75	1 mi.	E-W	500 AG	6232	IGRF65, 55369	OF77-192
3074	West Charlotte	LKB	08/75-11/75	1 mi.	E-W	500 AG	3440	IGRF65	OF78-1088
3075	North Carolina Coast	LKB	09/75-11/75	1 mi.	E-W	500 AG	2400	IGRF65	OF77-804
3086A	South-central N. C. East	GeoMet.	12/75-02/76	1 mi.	E-W	500 AG	2000	IGRF75, 53918	OF76-815
3086B	South-central N. C. West	GeoMet.	12/75-04/76	1 mi.	E-W	500 AG	2600	IGRF75, 54098	OF77-205
3104	Near Charlotte	Applied	12/76	1 mi.	E-W	500 AG	2776	IGRF65	OF77-723
3119	Concord	LKB	12/77-02/78	1 mi.	E-W	500 AG	1045	Total count	OF02-361
3183	Blood Mtn.-Chattahoochee	Applied	01/81	0.5 mi.	NW-SE	500 AG	2285	IGRF75, 53961	OF81-935
4156	Danville	BGM	03/94	0.5 mi.	E-W	400 AG	3000	IGRF90	OF94-219

Description of Table

No.: Internal USGS identification number
Name: Internal project name (not always the name used in publication title)
Flown By: Company or government agency who flew the original survey
Spacing and Dir.: Primary flight-line spacing and primary flight-line direction
Altitude: Primary flight altitude in feet; B = barometric elevation, AG = above ground draped over topography
LnMi.: Approximate total of line miles flown for this survey
Datum: Indicates if a regional field was removed and, if it could be determined, the base value removed. Total field = no regional was removed. Arb. (arbitrary) datum = the base value removed was not stated on the map or in survey reports.
Publication: Brief publication reference*. USGS publications are listed as: Open-File reports = OFxx-yyyy where xx is the publication year, Bulletins and Professional Papers = B-yyyy or P-yyyy, Geophysical Maps = GP-yyyy, Miscellaneous Field Studies Maps = MF-yyyy, Miscellaneous Investigations Maps = I-yyyy.

*For a full reference for USGS publications see: http://library.usgs.gov/