Following are some organizations that I belong to:

      National Association of Watch and Clock Collectors (NAWCC)

     NAWCC Tower Clock Chapter #134                        

     NAWCC Chicagoland Chapter #3

   British Horological Institute

  Antiquarian Horological Society

Here are some links I've found to be quite informative:

   http://www.towerclocks.org/index.php A site by Aldo Javier Albinarrate devoted to a pictorial record of tower clocks around the world. Contains much interesting information on history and restorations.

  Links to Tower Clocks Sites World Wide, Views of tower clocks around the world by Donn Haven Lathrup

                      Horology -The Index . A terrific resource for all manner of horological information.

Toine Daelmans, Netherlands.  A site for tower clocks and astronomical clocks. Professional tower clock restoration, installation, repair and preservation. (In Dutch language).

  Barrie's virtual museum of clocks. A collection of pictures and information about more than
200 clocks, including many electric clocks and master clocks.

    Delightful Machines . Information for the person interested in antique machinery and clocks. Take a look at the special section on remontoire  

            Carlo Croce master clock maker, Cogorno, Italy                         

    A site by Paul A. Prescott featuring time and other kinds of locks.

    Paul Strickland. Specialists in antique, electric and turret clocks, England.

    Peter Holtby. Master clock maker and builder of the Millenium clock featured in the skeleton clock section.

    Gilbert Veraart, Netherlands. Pulsyntetic electric clock site.

Clocks, the monthly magazine for clock collectors, repairers and makers worldwide

Interclock Antik. A german firm specializing in the sale of tower clocks.