Media type: E-Article Title: Studies on long-term performance of organic and conventional cropping systems in Pennsylvania Contributor: Seidel, Rita; Moyer, Jeff; Nichols, Kris; Bhosekar, Vijay imprint: Springer Science and Business Media LLC, 2017 Published in: Organic Agriculture Language: English DOI: 10.1007/s13165-015-0145-z ISSN: 1879-4238; 1879-4246 Keywords: General Agricultural and Biological Sciences Origination: Footnote: