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J

Journal Citation Reports (Web of Knowledge)
Journal Citation Reports is a comprehensive and unique resource tool that allows you to evaluate and compare journals using citation data drawn from over 7,000 scholarly and technical journals from more than 3,300 publishers in over 60 countries. It is the only source of citation data on journals, and includes virtually all specialties in the areas of science, technology, and social sciences. Journal Citation Reports can show you the most frequently cited journals in a field, highest impact journals in a field, leading journals in a field, and most published articles in a field.

JSTOR
JSTOR provides an archive to several hundred scholarly journals. In most cases the archive ends 3-5 years prior to the most recently published issues.