1. Valníček, B., Letfus, V., Blaha, M., Švestka, Z., and Seidl, Z., Bull. Astro. Inst. Czech., 10, 149 (1959).
2. “Compilations of Solar–Geophysical Data, Boulder” (March and August 1959).
3. “Solar Data, Moscow–Leningrad” (March and August 1959).
4. Švestka, Z., Bull. Astro. Inst. Czech. (in the press).
5. Severny, A. B., and Bumba, V., The Observatory, 78, 33 (1958).