Iowa Heritage Digital Collections
State Library of Iowa

Browse Items (170 total)

Piece of equipment and press, 1939
Piece of equipment and press, 1939
Piece of equipment, close-up view,  1937
Piece of equipment, close-up view,  1937
Pouring milkweed seeds into the solvent oil extractor, Oil extraction plant
Pouring milkweed seeds into the solvent oil extractor, Oil extraction plant
Processing plant, 1938
Processing plant, 1938
Professor David R.  Boylan  working with shaft furnace
Professor David R.  Boylan  working with shaft furnace
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