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JUST CLICK AND DOWNLOAD (please, see the attached PDF).

First, click the folder to open it and then, click the score. 
At the top of the page, you'll have the option to "Download" it (click again).

The files are listed in alphabetical order, as per the Library Catalog,just 
the same as written in the website pages and menus 
(for example, Bach J.S., Bill Evans, etc.), 

Then, please, search for the document names in the respective alphabetical folders. 
Some composers have specific folders.