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![Observations on the Building Stone of the Ottawa Country [microform] Being an Abridgement of a Lecture Delivered Before the Ottawa Silurian Society, the 15th November, 1858](/_next/image?url=https%3A%2F%2Fstorage.googleapis.com%2Fmenrva_img_storage%2Fcovers%2F9781014508768_eef52f1e.jpg&w=3840&q=80)