Following are some organizations and periodicals that I belong and subscribe to:

      National Association of Watch and Clock Collectors (NAWCC)

     NAWCC Tower Clock Chapter #134                      

     NAWCC Chicagoland Chapter #3

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

   British Horological Institute

  Antiquarian Horological Society

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

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

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.

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

  Astronomical clock building. Pieter Merckx shows several planisperic-based clocks he has built.

  A fascinating private museum containing a complete planetarium in ceiling of the house! Located in Zuylenburgh, Holland

  The Klokhus, a Dutch site dedicated to disemination of various horological topics.

Clock History.com . History of Westclox clocks and watches, and history of Telechron, Seth Thomas and Standard Electric Time Company clocks.

Collectible Detective.com. A vintage and antique directory.

http://www.smithofderby.com/. A U.K. firm established in 1856 and still making tower clocks, architectural and specialty time pieces

http://www.patrimoine-horloge.fr/astronomiques.html . A simply amazing and pictorially rich site covering scores of Europe's major astronomical clocks. If you can't travel there or get into the towers this is the next best thing. It is, however, in French, but the photos are enough and there is a rough translation available through Google.