The aerial photos you are looking at are about six years old, dated from arround 2000. Some are more recent, some might be a little older. The US Geographic Survey project photos the entire country on a regular basis, photographing large metropolitain areas more regurarly with high power satalites. I work with these and other aerial photos on a regular basis and have to know when the photos are taken. I schedule aerial photos for my company and our airport facilities on a regular basis, and let me tell you it aint cheep....
You should be able to get hardcopies from the local county seats for a nominal fee.
Keep on chuckin'
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