Do Not use elevations on the section, quarter and centers of sections, they are used for aerial photo control only. Do Not use elevations marked "EU". These are unadjusted bench marks, they are for Saint Paul Surveyor's Office use only. When viewing a dwf file via Autodesk's DWF Viewer (formerly Autodesk Express Viewer) application you can use the Home key to view the entire image, Page Up or Page Down keys to zoom in or out, and the arrow keys to move about in the image, you must left click your mouse in the image for the keyboard keys to take effect. You can also right click your mouse to active a pop-up selection box allowing you to pan, zoom, zoom rectangle, fit to window and print.