As suggested by a friend on Facebook, this reminds him of Italo Calvino’s 1979 book If on a Winter’s Night a Traveler; the types of reading material as you navigate a crowded bookstore:
Books You Haven’t Read;
the Books You Needn’t Read;
the Books Made for Purposes Other Than Reading
the Books Read Even Before You Open Them Since They Belong to the Category of Books Read Before Being Written;
the Books That If You Had More Than One Life You Would Certainly Also Read But Unfortunately Your Days Are Numbered;
the Books You Mean to Read But There Are Others You Must Read First;
the Books Too Expensive Now and You’ll Wait ‘Til They’re Remaindered;
the Books ditto When They Come Out in Paperback;
Books You Can Borrow from Somebody;
Books That Everybody’s Read So It’s As If You Had Read Them, Too;
the Books You’ve Been Planning to Read for Ages;
the Books You’ve Been Hunting for Years Without Success;
the Books Dealing with Something You’re Working on at the Moment;
the Books You Want to Own So They’ll Be Handy Just in Case;
the Books You Could Put Aside Maybe to Read This Summer;
the Books You Need to Go with Other Books on Your Shelves;
the Books That Fill You with Sudden, Inexplicable Curiosity, Not Easily Justified;
the Books Read Long Ago Which It’s Now Time to Re-read;
the Books You’ve Always Pretended to Have Read and Now It’s Time to Sit Down and Really Read Them;
the New Books Whose Author Or Subject Appeals To You;
the New Books By Authors Or On Subjects Not New (for you or in general);
New Books By Authors Or On Subjects Completely Unknown (at least to you).
Digital, Data & Policy 
As suggested by a friend on Facebook, this reminds him of Italo Calvino’s 1979 book If on a Winter’s Night a Traveler; the types of reading material as you navigate a crowded bookstore:
Books You Haven’t Read;
the Books You Needn’t Read;
the Books Made for Purposes Other Than Reading
the Books Read Even Before You Open Them Since They Belong to the Category of Books Read Before Being Written;
the Books That If You Had More Than One Life You Would Certainly Also Read But Unfortunately Your Days Are Numbered;
the Books You Mean to Read But There Are Others You Must Read First;
the Books Too Expensive Now and You’ll Wait ‘Til They’re Remaindered;
the Books ditto When They Come Out in Paperback;
Books You Can Borrow from Somebody;
Books That Everybody’s Read So It’s As If You Had Read Them, Too;
the Books You’ve Been Planning to Read for Ages;
the Books You’ve Been Hunting for Years Without Success;
the Books Dealing with Something You’re Working on at the Moment;
the Books You Want to Own So They’ll Be Handy Just in Case;
the Books You Could Put Aside Maybe to Read This Summer;
the Books You Need to Go with Other Books on Your Shelves;
the Books That Fill You with Sudden, Inexplicable Curiosity, Not Easily Justified;
the Books Read Long Ago Which It’s Now Time to Re-read;
the Books You’ve Always Pretended to Have Read and Now It’s Time to Sit Down and Really Read Them;
the New Books Whose Author Or Subject Appeals To You;
the New Books By Authors Or On Subjects Not New (for you or in general);
New Books By Authors Or On Subjects Completely Unknown (at least to you).