Assertion: batman's title | /r/HasProperty | then-highest dc selling series
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text: Supergirl starred in her first solo eponymous monthly series beginning in 1972 until October 1974, when her monthly title merged with Superman's Girl Friend, Lois Lane, and Superman's Pal Jimmy Olsen to produce a new title: then-highest DC selling series called The Superman Family, where she eventually became the steady lead story.