From a BHL Blog Post by Grace Costantino:
We’ve added functionality to the BHL book viewer that makes it easier to generate a PDF for an article.
When you are viewing an article that has been defined in BHL, you can now quickly and easily generate a PDF of that article using our new “Download Article” option in the “Download Contents” dropdown menu.
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Please note that defining articles in BHL is an ongoing process, and not all articles in the Library have been indexed. If the article you need has not yet been indexed, you can still use our “Select Pages to Download” feature to manually select the article pages and generate a PDF. Learn more about the “Select Pages to Download” feature in our FAQ.
Direct to Complete Blog Post and Screenshots