Continent-scale map
The Geological Society of America
compiled by David D. Blackwell and John L. Steele ; with contributions from David S. Chapman ... [et al.]
The Geological Society of America c1992 Continent-scale map 006
Available at 7 libraries
by M.L. Zoback ... [et al.]
The Geological Society of America c1991 Continent-scale map 005
Available at 5 libraries
compiled by E.R. Engdahl
The Geological Society of America c1988 Continent-scale map 004
Available at 6 libraries
by Gravity Anomaly Committee under the auspices of the Geological Society of America and International Gravity Commission
The Geological Society of America c1987 Continent-scale map 002
by Committee for the Magnetic Anomaly Map of North america, The Geological Society of America
The Geological Society of America c1987 Continent-scale map 003