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    Lenntech

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    Category: Equipment

    Supplies industrial water disinfection systems such as ozone, uv and chlorine dioxide. Site Offering English and Dutch versions.

    Lenntech Water Treatment & Air Purification

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    Category: Nanomaterials

    Offers nanofiltration systems.

    Lenntech

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    Category: Odor Control

    Specialised in odour control solutions and systems such as scrubbers, adsorbers and biofilters.

    San Diego Historical Society

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    Category: History

    History of the San Diego region with timeline, history, books, photos, biographies, postcards, and over 50 years of articles from the Journal of San Diego History. Research Library and Museum of San Diego History information.

    Best History Websites

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    Category: Education

    A portal created for students, history educators, and general history enthusiasts. Sites are rated for usefulness and accuracy, that will help studies or teachers in a wide variety of topics and periods in history.

    History and Theory

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    Category: Journals

    Quarterly on critical philosophy of history, speculative philosophy of history, historiography, history of historiography, historical methodology, critical theory and time and culture.