NASA Blue Marble imagery

[Mark Howard]

JMEWS II/Medical Situational Awareness (MSA)
Akimeka, LLC
1305 North Holopono Street, Suite # 3
Kihei, HI 96753
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mhoward at akimeka.com
Anybody know where I can download georeferenced tiles of Blue Marble imagery - preferably Aug.?  The NASA site has PNG files - but they have no georeferencing and are pretty big. I'd have to process (tile) them anyway. 

TIA for any insight!
Mark