Exploration; Travel; Central America; Panama; Darien
Box 1: folder 7, Source Material Relating to Richard A. Tewkesbury’s trips to the Darien in 1939 and 1940. Contains Tewkesbury’s unpublished writings which consist of his day by day notes of his trek through the Darien from July 6 to August...
Exploration; Travel; Central America; Panama; Darien
Box 1: folder 8, Source Material Relating to Richard A. Tewkesbury’s trips to the Darien in 1939 and 1940. Contains Tewkesbury’s unpublished writings which consist of his diary and day by day notes of his second trip through the Darien from...
Exploration; Travel; Central America; Panama; Darien
Box 1: folder 9, Source Material Relating to Richard A. Tewkesbury’s trips to the Darien in 1939 and 1940. Tewkesbury's published writings included in these materials are: “There’s Drama In Mexico”; “An Explorer Sets Forth”; “Darien...
Exploration; Travel; Central America; Panama; Darien
Box 1: folder 10, Source Material Relating to Richard A. Tewkesbury’s trips to the Darien in 1939 and 1940. Contains excerpts from various periodicals and publications highlighting Tewkesbury and his expeditions.
Exploration; Travel; Central America; Panama; Darien
Box 1: folder 11, Source Material Relating to Richard A. Tewkesbury’s trips to the Darien in 1939 and 1940. Contains radio scripts providing publicity for Tewkesbury and his travels.
Exploration; Travel; Central America; Panama; Darien
Box 1: folder 12, Source Material Relating to Richard A. Tewkesbury’s trips to the Darien in 1939 and 1940. Contains controversial material covering Tewkesbury and his travels.
Exploration; Travel; Central America; Panama; Darien
Box 1: folder 13, Source Material Relating to Richard A. Tewkesbury’s trips to the Darien in 1939 and 1940. Contains informational materials collected on the Indians of the Darien.
Iowa State University; Dept. of Chemical and Biological Engineering; Fertilizers
The researcher on the right is standing in front of the Link-Belt Roto Louvre Dryer used in sulphate fertilizer research in the West Chemical Engineering Building. The researcher on the left is standing in front of the control equipment taking...
Iowa State University; Dept. of Chemical and Biological Engineering; Agricultural wastes
A large drum is partially visible on the left and a large can is sitting on a table in the center. There are a several pipes, valves, and a motor on the lower right. A Sweetland filter is on the floor at the bottom center of the photograph.
Iowa State University; Dept. of Chemical and Biological Engineering; Agricultural wastes
A group of large cylinders and tubs containing agricultural by-products are in the foreground. One of the cylinders is empty and waiting to be filled. There are towels hanging over the tubs and there is a large tank sitting on a table in the corner...
Iowa State University; Dept. of Chemical and Biological Engineering.
A researcher is working with a machine labeled analytical liquid chromatography. A screwdriver, scissors and other tools are on the workbench. This photograph was featured in the Chemical Engineering Brochure for 1978.
Iowa State University; Dept. of Chemical and Biological Engineering
Two researchers are standing before a bubble cap column. The column is surrounded by metal scaffolding and stairs lead to the upper levels. One individual is standing on the highest level near the top of the column.
