Sentinel plot sign
A sentinel plot located at Sidney in Fremont County. (Ralph von Qualen)
This image appears in the following article:
Sentinel plot sign
[1]
Source URL:
http://www.ipm.iastate.edu/ipm/icm//ipm/icm/node/320
Links:
[1] http://www.ipm.iastate.edu/ipm/icm/2006/2-27/track.html
