What was the number one movie in July of 1975?

What was the number one movie in July of 1975?
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Things that happened in July of 1975: Your dad played lawn darts after 4 beers, ARPANET just got going (soon to become the internet), and this movie topped the box office.

There were definitely some bangers that came out that year, but in the middle of a sweltering summer, this one ruled them all. What movie was it?