SMITH R.A.
radio aids to navigation: / r.a. smith - 1 ed. - UK MACMILLAN C.1948. - "xi, 144p.; 22 cm."
--RADIO IN AERONAUTICS--RADIO IN NAVIGATION
TL695 / .S55 1948
radio aids to navigation: / r.a. smith - 1 ed. - UK MACMILLAN C.1948. - "xi, 144p.; 22 cm."
--RADIO IN AERONAUTICS--RADIO IN NAVIGATION
TL695 / .S55 1948