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[Robert J. Sager, David M. Helgren, Alison S. Brooks]
Holt, Rinehart and Winston c2003 Annotated teacher's ed
Available at 4 libraries
Robert J. Sager, David M. Helgren, Alison S. Brooks
Holt, Rinehart and Winston c2003
Available at 6 libraries
[David M. Helgren, Robert J. Sager]
Holt, Rinehart and Winston c1995 Annotated teacher's edition
Available at 3 libraries
[Robert J. Sager, David M. Helgren, Saul Israel]
Holt, Rinehart and Winston c1992 Rev. ed.
Available at 23 libraries
Holt, Rinehart and Winston c1989
Available at 5 libraries
Jack McClintock and David Helgren
Quill, William Morrow c1986
: pbk
Available at 1 libraries
David M. Helgren, Robert J. Sager, Saul Israel
Holt, Rinehart and Winston c1985
by David M. Helgren
University of Chicago, Dept. of Geography 1979 Research paper / the University of Chicago, Department of Geography no. 185
Available at 17 libraries