This is a DOQQ map showing the meander scars of a river in Kansas. It can be found at http://www.emporia.edu/earthsci/student/laird2/gisproject.html

The is a DEM map of the Great Lakes from the MSU Institute of Water Research. It also shows the boundaries of the watershed for these lakes. The map can be accessed at http://www.iwr.msu.edu/outreach/adv_tech/agp/gl-dem.htm

This is a DLG map of the entire Lake Tahoe area provided by the USGS. It can be found at http://tahoe.usgs.gov/DLG.html

This is a DRG image of Emerald Bay, the southwest corner of Lake Tahoe. It can be found on the USGS website at http://tahoe.usgs.gov/DRG.html

This is an example of how to construct isopleths on a map from the Food and Agriculture Organization of the United Nations. It can be found at http://www.fao.org/DODREP/003/TO446E/TO446E06.htm

This is an isiopach map demonstrating the extent of Silurian (a geologic time period about 443 million years ago) evaporite basins in the Great Lakes area. This map can be found at http://heigheredbcs.wiley.com/legacy/college/levin/0471697435/chap-tut/chaps/chapter10-06.html

This is an isohyet map of the precipitation in Antarctica. It is from the University of Wyoming atmospheric science page and can be found at http://www.das.uwyo.edu/~geerts/cwx/notes/chap3/antarctica.html