I have previously enjoyed many of the volumes by John Kenneth Muir, and was even privileged to provide some content to his book Horror Films of the 1990s. He just released a new book titled Science Fiction and Fantasy Films of the 1970s. The Amazon description reads:
Science Fiction and Fantasy Films of the 1970s by John Kenneth Muir is a detailed history and analysis of more than 100 genre films produced between the span of 1970 – 1979. The book looks at the historical context of dystopian, post-apocalyptic, and outer space movies of the day, and reveals how these movies are both a look at tomorrow and a product of their times.
Click to order your copy at the link above through the TheoFantastique Store.