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A list of Free niche specific web directories and related websites for submission.
Add your site - $10 per month
aip.org
Category: Web Directories
rain.org
radwaste.org
hiramp.tripod.com
het.brown.edu
dctech.com
physics-directory.com
physcon.ru
web.mit.edu
physnet.uni-oldenburg.de
llek.de
physics.org