The light curve of 3C 66A.

I. Tuorla Observatory, Tuorla 21500 Piikkio, Finland ‘. Instituto de Astrofisica de Canarias, La Laguna, 38200 Tenerife, Spain 3. 1655 Main St. Stittsville, Ont. K2S 1N6, Canada 4. Instituto de Astronomia-UNAM, Apdo. Postal 70-264, 04510, Mexico, D.F. Mexico 5. Department of Astronomy, Indiana University, Swain West 319, Bloomington, In 47405, USA 6. Crimean Astrophysical Observatory, P/O Naunchny, 334413 Crimea, Ukraine ‘. University of Oxford, Dept. of Astrophysics, Nuclear&Astrophysics Laboratory, Keble Road Oxford, OX1 3RH, England 8. Hamburg Sternwarte, Hamburg Universitat, Gojensbergweg 112, D-2050, Hamburg 80, Germany ‘. Bradley Observatory. Agness Scott College, Decantur, GA, 30030, USA lo. Capilla Peak Observatory, University of New Mexico, Albuquerque, NM 87131, USA