Oil prices drop on Greece, US output worries

US benchmark West Texas Intermediate for July delivery dropped 44 cents to $59.52 a barrel compared with Friday's close. Brent North Sea crude for July shed $1.28 to stand at $62.61 a barrel in London trade. The US reported industrial output fell another 0.2 percent in May after an 0.5 percent drop in April, not unexpected but still casting a cloud on the strength of the economy.