The Regional History Series book style uses em dashes (—) within sentences and en dashes (–) between spans of years and pages. Below are examples:
For some, there remains little or no evidence of their pictorial work—perhaps only a reproduction based on a photograph, or a film review from the newspaper—and now, this book.
Solomon Carvalho also used the daguerreotype process. He accompanied John Charles Frémont's final Western expedition of 1853–1854.
14. Ibid., 139, 144–145.
To create an em dash, hold down the [Alt] key and type 8212
To create an en dash, hold down the [Alt] key and type 8211