File:Hal Keller.jpg

Image:Hal Keller.JPG is a low resolution scan of a photo used to illustrate the article.This image is ineligible for copyright and therefore in the public domain, because it consists entirely of information that is common property and contains no original authorship.

The two-dimensional work of art depicted in this image is in the public domain in the United States, either because it was first published before 1929, or for the reason described either above or below this template. This photograph of the work is also in the public domain in the United States (see Bridgeman Art Library v. Corel Corp.).
Note: Unless the creator died more than 70 years ago, the work of art is not public domain worldwide.