Thanks for all the replies. Thanks also to the volunteers at http://cemetery.canadagenweb.org/
the listing for Haliburton has been recently expanded.
If anyone does have listings/photos of the graves of the Rev'd Laughlan A MacLean, his wife Sarah Jean Munro, and their daughter Sarah Jean Eileen MacLean (who married Ronald Wark), I would really appreciate them contacting me via my Ancestry profile.
Thank you very much.