id	domain	url
ebl-621	creativecommons.org	https://creativecommons.org/licenses/by-nc/4.0)
ebl-621	www.jstor.org	http://www.jstor.org/stable/1349432
ebl-621	www.jstor.org	www.jstor.org/stable/525591
ebl-621	www.jstor.org	http://www.jstor.org/stable
ebl-621	pdf.usaid.gov	http://pdf.usaid.gov/pdf_docs/pnaan484.pdf
ebl-621	dx.doi.org	http://dx.doi.org/10.1016/s0140-6736(68
ebl-621	www.ncbi.nlm.nih.gov	www.ncbi.nlm.nih.gov/pmc/articles
ebl-621	www.jstor.org	http://www.jstor.org/stable/1830899
ebl-621	www.amherst.edu	www.amherst.edu/system/files/media/1479