Note
QST, Dec 1972, p. 162.
QST, Jan 1973, p. 144.
QST, Jun 1973, p. 161.
QST, Feb 1974, p. 129.
QST, Feb 1975, p. 113.
QST, Apr 1976, p. 95.
QST, Dec 1977, p. 127. ("year end close-out")
References
Brief description. Popular Electronics, Dec 1974, p. 12.