Photograph albums (7-5)

I believe the answer is:

picture-books

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'photograph albums' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'photograph albums' is the wordplay.
'photograph' becomes 'picture'.
'albums' becomes 'books' (I can't justify this - if you can you should give a lot more credence to this answer).
'picture'+'books'='PICTURE-BOOKS'

Can you help me to learn more?

I've seen this clue in The Irish Independent.

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