H. Eelsalu

• Ajastult ajastule
• Astronoomialeksikon
• Johann Heinrich Mädler, 1794-1874
• Meteorology in Estonia in Johannes Letzmann's times and today
• Statisticheskie print͡s︡ipy galakticheskoĭ opticheskoĭ astronomii
• Theoretical foundations of stellar statistics
• Theory of basic galactic statistical research systems