@article{Tilton:135415,
      recid = {135415},
      author = {Tilton, John E.},
      title = {Innovative Activity and Comparative Advantage in Mining},
      address = {1997},
      number = {408-2016-25483},
      pages = {15},
      year = {1997},
      url = {http://ageconsearch.umn.edu/record/135415},
      doi = {https://doi.org/10.22004/ag.econ.135415},
}