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Preservation Trades Network (PTN) (Popularity:  )
http://www.ptn.org/
Contractors and designers specializing in historic restoration. Includes information on trade shows and events.
Category:
Business - Construction and Maintenance - Historic Preservation
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IANTD (Popularity: )
http://www.iantd.com/
International Association of Nitrox and Technical Divers (IANTD) offers mission statement, information on training programs, articles, and contacts.
Category:
Recreation - Outdoors - Scuba Diving - Technical Diving
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Splash Water Sports Scuba and Snorkelling Center (Popularity: )
http://www.splashws.com
PADI 5 star Instructor Development Center features information on instruction, travel, an online newsletter, contact details and hours of operation. Located in Pittsburgh.
Category:
Recreation - Outdoors - Scuba Diving - Regional
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St. Croix Scuba (Popularity: )
http://www.stcscuba.com/
Dive center located in Hudson, information includes local dive sites and fun dives on Lake Superior shipwrecks.
Category:
Recreation - Outdoors - Scuba Diving - Regional
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Aqua Hut (Popularity: )
http://www.aqua-hut.com/
Toledo dive center lists information on instruction, travel, driving directions and hours of operation.
Category:
Recreation - Outdoors - Scuba Diving - Regional
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Pan Aqua Dive Center (Popularity: )
http://www.panaqua.com/
Located in Brookfield. Training, class schedule, equipment, travel trips, events, and online shopping.
Category:
Recreation - Outdoors - Scuba Diving - Regional
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