THELMA & LOUISE, of course
don't know if this is a mainly USA film
search, or if french films are allowed . . .
but the french have loads of films with
two female leads . . . for starters,
DIABOLIQUE
ENTRE NOUS
LA CEREMONIE
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Online resources for film/TV studies may be found at ScreenSite
http://www.tcf.ua.edu/ScreenSite