High frequency communications
Betts, J. A.
High frequency communications [Book] / [by] J. A. Betts. - New York : American Elsevier Pub. Co., [c1967]. - 98 p. : illus. ; 23 cm. - Introductory science texts. .
Index includes
All.
Shortwave radio.
621.384151
High frequency communications [Book] / [by] J. A. Betts. - New York : American Elsevier Pub. Co., [c1967]. - 98 p. : illus. ; 23 cm. - Introductory science texts. .
Index includes
All.
Shortwave radio.
621.384151