I was assigned this book for school, but I found Images of America to be an interesting and unique way to tell the stories of history. I am an avid reader, and even still, the photographic narrative was more engaging than a standard historical account. The Irish were represented enough throughout Colorado history that I feel the book covers the extent of (white) Colorado's history.
In all, I think this is an ideal coffee-table-book. It's exclusively photos and factoids. It has tidbits about well-known figures such as Oscar Wilde, Jack Dempsey, and John F. Kennedy, but it of course is more likely to cover those that would only be famous to Coloradans, J. K. Mullen, Thomas Francis Walsh, and Molly Brown.