001: 2600
003: Starlibrary PMS 4.5
005: 20180420
020: ^a81-224-0071-x
066: ^aN..F
072: ^aElectron Tubes
082: ^a621
100: ^aN. N. Purkait
240: ^aFoundations of electronics
245: ^aFoundations of electronics
260: ^c1995
650: ^aElectronEmission
650: ^aIntroductory Concepts