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I must admit that I have always been fascinated by this style of portraiture - mainly due to the exceptional control over the lighting. I have only seen one photography technique book dedicated to this style of photography (by Roger Hicks listed on my main website).
The thing that inspires me the most is that many of the portraits are modern - taken in 2006 - just showing that the art form is far from dead. You will find some examples of Studio Harcourt's work here.