Abstract: "The relative isotopic abundance of copper has been measured in a number of minerals. Suites of samples from Michigan and the Colorado Plateau have been examined to determine if local variations due to isotopic exchange or diffusion could be found. The relative isotopic abundance of copper in specimens from a number of other places was also determined. The variations noted were small but in most cases were felt to be significant because they were larger than the experimental error (0.1 percent in the ratio). A total spread of +3 to -8 parts per mil compared to the standard was found in the specimens tested."

From Junebug Clark's introduction: "This scrapbook of the early work of Junebug Clark, was put together by Bernice Clark, my mother, and preserved by my wife, Kay Clark. The original is getting a little bit fragile and delicate so in order for you to take a gander at it, this document was created. I hope that you will have the time to set a spell and go through the pictures and stories within. It is a little bit embarrassing and unbeliveable for me to look at but after undertaking this project I have reconnected with some long lost friends and have come to realize that photography has been a big part of my life and the best part of my life. It was my start and I am forever grateful to the people named on this cover page and included in The Early Years."