From Paul Brians’ book Common Errors in English Usage (to which he generously allows full access at no charge at the Washington State University website), here is an English usage worksheet on differentiating the adjectives historic and historical. This is a full-page worksheet with Professor Brians’ four-sentence reading augmented with some definitional text I worked up to complement it. There are ten modified cloze exercises for students to complete.
However, this worksheet, like most others on Mark’s Text Terminal, is formatted in Microsoft Word. So you may do as you wish with this document.
If you find typos in this document, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.