Popular science (U.S.A.(Popular Science, Box 54965, Boulder CO 80322-4965) : Times Mirror Magazines, Inc., 1988)
$1!FC!Ci!R;!]>(B1.49$1!2m (B(hb)s
v.232,no.6,v.233,no.1-6(1988),v.234,no.1-6,v.235,no.1-6(1989),v.236,no.1-6(1990)