For a long time I have disliked the keyword "abstract" to describe photographs, because, in my opinion, a photograph cannot show something which is truly abstract. However, after reading articles and interviews by Eric Meola, I have changed my mind (I recommend reading The black wall, for example). Photographs can very well be abstract in the sense that they do not aim at documenting an actual subject, but rather show an ephemeral quality - for example color under a particular condition, light and shadow patterns, or a tiny detail of a larger whole. It may be compared to a writer who describes a particular character trait of a person independent of what that person looks like. In this sense, abstract photographs record character traits of a subject rather than its looks.
There is a plethora of interesting and educative texts by and about Eric Meola. Besides his homepage, including the audio commentaries to several other photographs, I particularly like his articles on The Luminous Landscape. I always find his explanations rich in content and full of insight and at the same time lacking any kind of dogmatism or boasting. They have a quality of humbleness, which I appreciate. His Legends Online site is very informative with short texts to many of his iconic photographs, Syracuse University, where he studied, has a long text about Eric Meola, there is of course also a wikipedia article, as well as many interviews such as the one by Chris Maher and Larry Berman, John Paul Caponigro, or FuseVisual. This is only a small collection of links; if you are interested many more websites and even books wait to be discovered.