You are free to quote site material per Fair Use Guidelines.
While most images are clearly licensed as public domain, others of archaeological artifacts are so old that they are in the public domain. This site's position is the same as that of the Brooklyn Museum, that "Works created by United States and non-United States nationals published prior to 1923 are in the public domain, subject to the terms of any applicable treaty or agreement." Simple images of ancient archaeological artifacts are considered within the public domain--nonetheless I provide photographer names when possible, as well as links to websites where the photograph was officially found. Since I only provide small, lower-quality images of archaeological artifacts (with the exception of images from Wikimedia Commons), I encourage those seeking higher-resolution images to visit the source sites.