From Introduction: "A review is given of the nomenclature, sources, imports, statistics, common methods of preparation, and testing of mineral pigments. A description of the Deer Park-Spokane colored-clay district and the laboratory methods of preparation of these colored clays, ochers, and siennas follows. The following report is merely preliminary in nature, only three months during the summer of 1927 being devoted to the laboratory investigation."

Photograph of Catherine Nimitz, Nancy Nimitz, and Chester W. Nimitz seated on bench or picnic table. Catherine Nimitz sits on the left in a dark long-sleeved dress with her hands clasped together in her lap. Chester W. Nimitz sits on the right with his arm draped over his propped-up leg and wearing a white turtleneck sweater, dark shorts and long wool socks. Peaking between her parents' shoulders in Nancy Nimitz, her hair is cropped into a short bob.

Photograph of the Nimitz' car parked in a field next to a tent and camp set up. On the right Chester W. Nimitz can be seen behind a picnic table facing away from the camera.