Showalter, L.C..
Closed-Circuit TV for Engineers and Technicians / Showalter L.C.. - Indianapolis : Howard W. Sams, 1969. - 272 s.; 24 cm.
Closed-Circuit TV for Engineers and Technicians / Showalter L.C.. - Indianapolis : Howard W. Sams, 1969. - 272 s.; 24 cm.