Can't get bib info with ACM DL subject descriptor

If you browse down the classification structure present on the ACM digital library to a subject descriptor, the final results page does not provide the icon for grabbing the bibliographic information.

The equivalent is to enter this in the search box:
+CCS:"H.5.2" +CCS:"Voice I/O"

But, for completeness' sake, here's what I actually did:
1. Go to http://portal.acm.org, Select 'Go to the Guide'
2. Under 'Browse the Guide', select Computing Classification System
3. Select H. Information Systems
4. Select H.5 INFORMATION INTERFACES AND PRESENTATION (I.7)
5. Select H.5.2 User Interfaces (D.2.2, H.1.2, I.3.6)
6. Select Voice I/O
7. No icon in the address for grabbing items, even though the results looks exactly the same as a regular keyword search results page (which does allow you to grab).

I tried a few other subject descriptors and saw the same problem.

This is with 1.0.0b3.r1.

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