choice. This image is a derivative work of the following images: Image:Controlcard.jpg licensed with Cc-by-sa-3.0, GFDL 2008-10-03T21:36:40Z Una Smith 1280x960...
control points on an orienteering course. Date 2008 Source Own work Author Una Smith Other versions Derivative works of this file: Controlcard-crop.jpg...
Collection, 1948-2000 http://archon.lib.uh.edu/index.php?p=collections/controlcard&id=58 Repository Special Collections, University of Houston Libraries...
