Teachers. In 1940, a two-volume edition of Letters of Helena Roerich was published in Riga. A complete set of Roerich's letters is published by the International Centre of the Roerichs, where her epistolary heritage is kept. It was transferred to ICR by S.N. Roerich in 1990. During N.K. Roerich's Manchurian expedition, Roerich had corresponded with international organizations and coordinated activity for support the Roerich Pact, an international agreement for protection of artistic and scientific institutions and historical monuments. As a result of this work, the Roerich Pact was signed on 15 April 1935 by heads of 22 countries. In January 1948, after her husband's death, Roerich, together with her elder son, moved to Delhi and then to Khandala (Bombay's suburb), where they had waited for a steam ship from Russia with their entrance visas. But Russia denied their visas. They made their home in Kalimpong, though she continued to hope to return to Russia. Unfortunately, her numerous applications remained without response. Death Roerich died on 5 October 1955. In the place of her cremation the lamas raised a white stupa on which the following epitaph was carved: "Helena Roerich, the wife of Nicholas Roerich, thinker and writer, old friend of India". Legacy Minor planet On 15 October 1969 a minor planet of Solar System was discovered by astronomers of Crimean Astrophysical Observatory Nikolai Stepanovich and Lyudmila Ivanovna Chernykh. This planet was named in honor of Roerichs family. It was numbered 4426. Other On 6 July 1978 group of alpinists renamed a pass between the peaks "Roerich" and Belukha "Urusvati" in honor of Roerich. On 9 October 1999, during jubilee celebrations devoted to 125th anniversary of N. K. Roerich's birthday and the 120th anniversary of Roerich's demise, a monument was established near the entrance of the International Centre of the Roerich's. This monument is a sculpture of Nicholas Konstantonovich and Helena Roerich. In 1999, the International Centre of the Roerich's instituted a jubilee medal "Helena Roerich" dedicated to the 120th anniversary of H. I. Roerich. In April 2003, the college of arts named after Roerich began to work in the building of the "Urusvati" Institute (India). In 2005, the museum of Helena Roerich was opened in a retired two-storeyed mansion known as "Crookety House" in Kalimpong. Here Roerich worked during the last years of her life. Opening of the museum was timed to the 50th anniversary of her death. A public