id	domain	url
iogr-441	pdfs.semanticscholar.org	https://pdfs.semanticscholar.org/6d1c/3b10e3758bcd64d156060036af586ad42a2e.pdf
iogr-441	geology.com	http://geology.com/articles/methane-hydrates/
iogr-441	www.e-education.psu.edu	https://www.e-education.psu.edu/png520/m21_p3.html
iogr-441	pdfs.semanticscholar.org	https://pdfs.semanticscholar.org/6d1c/3b10e3758bcd64d156060036af586ad42a2e.pdf
iogr-441	www.sciencedirect.com	https://www.sciencedirect.com/science/article/pii/b9781856179454000078
iogr-441	www.sciencedirect.com	https://www.sciencedirect.com/book/9781856179454
iogr-441	www.sciencedirect.com	https://www.sciencedirect.com/book/9781856179454
iogr-441	geology.com	http://geology.com/articles/methane-hydrates
iogr-441	www.e-education.psu.edu	https://www.e-education.psu.edu/png520/m21_p3.html