Chick #29 (1970)
Chick #30 (1970) - hinting at lesbianism, and some kinky thigh-high
Chick #32 (1971) - lots of hair, in all the right places
Chick #33 - Hinting at a blowjob, of course. First time the issue
Chick #34 (1971) - First bondage and erect nipples on a cover.
Chick #35 - horror film motif