Volkov N. Photography in the invisible rays of the spectrum. In Russian /Volkov N. Fotografiya v nevidimykh luchakh spektra. Academy of Sciences of the USSR Scientific Popular Series of Academy of Sciences of the USSR 1935. 102 p. We have thousands of titles and often several copies of each title may be available. Please feel free to contact us for a detailed description of the copies available. SKUalbfda884b640ee1cd3.