Logos already sells a scanned copy of this.
I saw a print copy of this book for sale, and this was the blurb:
The Skeleton Key of Bible Prophecy
The historical situation in 1859 was not much different from our own day. Teaching on Bible prophecy was presented in a scattered "a verse here and a verse there" method," just as it usually is today. Samuel Lee's book was designed as a quick read to get Christians over 150 years to think about and study the topic biblically.
"The evidence that you have the true skeleton-key to the building, is not in the fact that some of the doors are opened by it, but in the fact that at every door the bolt yields readily to its touch. This is claimed for our theory." —Samuel Lee, 1859
I can buy this in print, but I would much rather have it in Logos.