Zobrazeno 1 - 10
of 47
pro vyhledávání: '"J. Douglas Helms"'
Autor:
Effland, Anne
Publikováno v:
Agricultural History, 2019 Jan 01. 93(1), 173-178.
Externí odkaz:
https://www.jstor.org/stable/10.3098/ah.2019.093.1.173
Publikováno v:
Encyclopedia of Soil Science, Third Edition ISBN: 9781315161860
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::827d258d078e8954330c320acb9775dc
https://doi.org/10.1081/e-ess3-120042708
https://doi.org/10.1081/e-ess3-120042708
Autor:
J. Douglas Helms
Publikováno v:
Agricultural History. 78:497-504
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2032ec9057e1f38b2d607b9fe1117e5d
https://doi.org/10.1215/00021482-78.4.497
https://doi.org/10.1215/00021482-78.4.497
Autor:
J. Douglas Helms
Publikováno v:
Agricultural History. 81:138-140
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8c06fe1a7fda06fbdddfabc932ea79a2
https://doi.org/10.1215/00021482-81.1.138
https://doi.org/10.1215/00021482-81.1.138
Publikováno v:
Encyclopedia of Soil Science, Second Edition ISBN: 9780849338304
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::31b9173347e6399f17053230683bd5cc
https://doi.org/10.1201/noe0849338304.ch204
https://doi.org/10.1201/noe0849338304.ch204
Autor:
J. Douglas Helms
Publikováno v:
The Public Historian. 18:122-123
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e136a9847af5a9c31e78f92d2d7f39f2
https://doi.org/10.2307/3377898
https://doi.org/10.2307/3377898
Autor:
J. Douglas Helms
Publikováno v:
Environmental Review. 8:132-145
Walter Clay Lowdermilk often described his profession as reading "the records which farmers, nations, and civilizations have written in the land." Few others have belonged to this profession. Certainly few had the inclination, ability, and opportunit
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0a0736900f6ef285751f4c0db3ebf662
https://doi.org/10.2307/3984191
https://doi.org/10.2307/3984191
Autor:
J. Douglas Helms, Robert E. Snyder
Publikováno v:
The Journal of Southern History. 51:306
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c55d22c0253f9a1bdc7da955107e1be7
https://doi.org/10.2307/2208856
https://doi.org/10.2307/2208856
Autor:
Doering, Otto C.1 doering@purdue.edu, Lawrence, Douglas J.2 doug.lawrence@blackwoodsgroup.com, Helms, J. Douglas douglashelms@gmail.com
Publikováno v:
Choices: The Magazine of Food, Farm & Resource Issues. 2013 2nd Quarter, Vol. 28 Issue 2, p1-5. 5p. 1 Graph, 2 Maps.