Books by E.C.; Johnston Harder:
Books in the extended shelves:
![[X-Info]](https://onlinebooks.library.upenn.edu/infouc.gif)
Harder, E.C.; Johnston, A.W.: Preliminary report on the geology of east central Minnesota, including the Cuyuna iron-ore district, Bulletin 15, Plate 1. (Minnesota Geological Survey, 2642 University Avenue, St. Paul Minnesota 55114, 1918) (page images at HathiTrust)- Harder, E.C.; Johnston, A.W.: Preliminary report on the geology of east central Minnesota, including the Cuyuna iron-ore district, Bulletin 15, Plate 2. (Minnesota Geological Survey, 2642 University Avenue, St. Paul Minnesota 55114, 1918) (page images at HathiTrust)
- Harder, E.C.; Johnston, A.W.: Preliminary report on the geology of east central Minnesota, including the Cuyuna iron-ore district, Bulletin 15, Plate 3. (Minnesota Geological Survey, 2642 University Avenue, St. Paul Minnesota 55114, 1918) (page images at HathiTrust)
- Harder, E.C.; Johnston, A.W.: Preliminary report on the geology of east central Minnesota, including the Cuyuna iron-ore district, Bulletin 15, Plate 4. (Minnesota Geological Survey, 2642 University Avenue, St. Paul Minnesota 55114, 1918) (page images at HathiTrust)
- Harder, E.C.; Johnston, A.W.: Preliminary report on the geology of east central Minnesota, including the Cuyuna iron-ore district, Bulletin 15, Plate 5. (Minnesota Geological Survey, 2642 University Avenue, St. Paul Minnesota 55114, 1918) (page images at HathiTrust)
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