I want to collect all of published articles in an specific field and country (e.g. soil spatial variability and Iran) from Science Citation Index EXPANDED (SCIEXPANDED), the Social Sciences Citation Index (SSCI) database, and the 2017 Journal Citation Reports (JCR) Science Edition of Clarivate Analytics.

I would love to hear the experience of others on the best way to get such data.

Please share if you know how to access this database.

Any comments greatly appreciated.