id	keyword
ertr-881	tourism
ertr-881	portugal
ertr-881	emigrants
ertr-881	portuguese
ertr-881	rural
ertr-881	research
ertr-881	development
ertr-881	tourism research
ertr-881	review
ertr-881	vol
ertr-881	ertr
ertr-881	analysis
ertr-881	http://ertr.tamu.edu/
ertr-881	santos