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I am a rising 2L and am formatting my resume for OCIs. I am splitting my summer between two firms and I was wondering how to mark the dates on my resume. Should I put "Summer 2019" for both firms, or include the months (June-July for firm #1 and July-August for firm #2)?

I would lean in favor of including the months, but "summer 2019" would also be fine. I don't think either way would be problematic. If your school's Career Services has a requirement/recommendation either way, do what they say.