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Full text available at:
DOAJ Directory of Open Access Journals
Available from 2003.
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Gale Academic OneFile
Available from 01/01/2007.
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Sabinet Open Access Journals
Available from 1921 volume: 19 issue: 1 until 1921 volume: 19 issue: 24.
Available from 1927 volume: 1 issue: 3 until 1929 volume: 3 issue: 24.
Available from 1932 volume: 6 issue: 1 until 1989 volume: 75 issue: 12.
Available from 2003 volume: 93 issue: 1.