Each RefWorks user account has a limit of 100MB of storage space for attaching PDFs or other files. However, you can have more than one RefWorks account and use up to that limit in each account.
More information about storage space and attachements in RefWorks (including maximum number of attachments allowed and maximum size allowed for individual attachments) is available on these pages of the RefWorks website:
RefWorks Attachment Feature FAQs - http://www.refworks.com/content/products/attachment/faqs.asp
Attachment Feature Fact Sheet - http://www.refworks.com/content/products/attachment/Attachment_Feature_Fact_Sheet.pdf
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