U.S. Census Block Map of Guam
U.S. Census Bureau
<a rel="nofollow" class="external free" href="http://ftp2.census.gov/geo/maps/blk2000/st66_Guam/County/66010_Guam/CBC66010_000.pdf">http://ftp2.census.gov/geo/maps/blk2000/st66_Guam/County/66010_Guam/CBC66010_000.pdf</a>