2 maps : color ; 51 x 86 cm. folded in envelope 31 x 23 cm + 1 text (12 pages : maps ; 28 cm.)
OCLC
ocm08816707
Cartographic Data
Scale 1:750,000
(W 91⁰30'--W 84⁰30'/N 48⁰45'--N 45⁰30')
Title from envelope.
Text includes bibliography.
Sheet 1. Bouguer gravity anomaly map, Lake Superior; Insets: Bottom physiography map ; Free air gravity anomoly [sic] map ; General geology Lake Superior region.--Sheet 2. Total magnetic intensity anomaly map, Lake Superior; Insets: Total magnetic intensity profile map; Observed total magnetic intensity contour map