The above 1971 list suggests what were once considered classics that olde school readers might have taken out from libraries and actually read. But by 1971, some 51 years ago, I recall only the following books were still being read or taught in Canada:
Moby Dick (university) A Tale of Two Cities Dr. Jekyll and Mr. Hyde Huckleberry Finn Frankenstein Jane Eyre Julius Caesar Alice in Wonderland Macbeth Romeo and Juliet Hamlet (issue 99, not listed here) Great Expectations (issue 43, not listed here).
Indeed, today, the three main classics still standing in high school would be 3 of the Shakespeare plays:
Romeo and Juliet Macbeth Hamlet.
Only Shakespeare has survived whereas other former literary giants (like Dickens and Twain) have not.
In any case, kids today not only do not generally read print novels or full-length books as they once did, they also no longer have much or any contact with major writers of Western civilization or classic works.