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Indexing

CAB Abstracts (Soil Science Database)

DOAJ (Directory of Open Access Journals)

EBSCOHOST

PROQUEST

Global eJournal Library

TUBITAK Ulakbim-Journalpark

CiteFactor

Crossref

SHERPA/RoMEO

Google Scholar

Open Academic Journals Index (OAJI)

Infobase Index

Academic Keys 

DTU Findit

Electronic Journals Library

Zeitschriftendatenbank (ZDB)

George Town University Library, USA

Open Science Directory

The Open Access Digital Library

Electronic Journal / WZB, Germany

New South Wales State Library, Australia

Universität Leipzig, Germany

Worldcat

Bielefeld Academic Search Engine (BASE)

refseek*

NHS Scotland eLibrary