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Tubes and transistor handbook by muiderkring 1961 (8th edition), publishers 'De Muiderkring' - Bussum - Netherlands.
Telefunken Roehren Halbleiter 1964
Brans Vademecum 1938 (Belgium)
MAZDA Valves & Picture Tubes Data Booklet 1966
Various Russian documents
Waiting for a tube selection ...
Reading Russian Tubes

Sources and references
[1] Tubes and transistor handbook by muiderkring 1961 (8th edition), publishers 'De Muiderkring' - Bussum - Netherlands.
[2] Telefunken Roehren Halbleiter 1964
[3] Brans Vademecum 1938 (Belgium)
[4] MAZDA Valves & Picture Tubes Data Booklet 1966