Langsdorf, .
Principles of direct-current machines / Textual Documents Langsdorf. - 6 / . - London : McGraw Hill Book Company , 1964. - 363 ; .
621.3132 / LAN/PR
Principles of direct-current machines / Textual Documents Langsdorf. - 6 / . - London : McGraw Hill Book Company , 1964. - 363 ; .
621.3132 / LAN/PR