Supersedes maps published by the Geological Survey, 1976-1981. "Unpublished base by U.S. Geological Survey, 1985." Includes notes. Alaska and Hawaii on verso. Scale 1:3,500,000.
Contents:
D. Declination chart -- F. Total intensity chart -- H. Horizontal intensity chart -- I. Inclination chart -- Z. Vertical intensity chart.
Series:
Geophysical investigations ; map GP-986
OCLC:
(OCoLC)35856590
LCCN:
96682379
Locations:
OVUX522 -- University of Iowa Libraries (Iowa City)
This resource is supported by the Institute of Museum and Library Services under the provisions of the Library Services and Technology Act as administered by State Library of Iowa.