The best way to use one of this images and link to them whether it be in a cache write up on on a web page would be to view the Link To Us page.
http://www.geocachingmaine.org/logos/GM-large.gif
411 x 101 x32 = Large
http://www.geocachingmaine.org/logos/GM-small.gif
208 x 51 x32 = Small
http://www.geocachingmaine.org/logos/GM-coinlarge.gif
154 x 154 x32 = Large
http://www.geocachingmaine.org/logos/GM-coinsmall.gif
100 x 100 x32 = Small
http://www.geocachingmaine.org/logos/PMGM-large.gif
411 x 101 x32 = Large
http://www.geocachingmaine.org/logos/PMGM-small.gif
208 x 51 x32 = Small