Regional maps of vertical magnetic intensity in Illinois
By: [by] Lyle D. McGinnis [and] Paul C. Heigold.
Contributors: Heigold, Paul C., joint author.
Published: 1961
Place of publication: Urbana
Language: eng
Number of pages: 12
Subjects: Geomagnetism -- Illinois.
Notes: Bibliography: p. 8.
Cover title.