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