I am looking for a specific book on non-Euclidean geometry that I read in my undergraduate years.
The unique characteristic of this book is that the first part of the book started by re-proving in modern notation the entirety of the first book of Euclid's Elements – given that all the geometry up until Euclid used the parallel postulate would be common to Euclidean and non-Euclidean geometries. The second part of the book treats a few equivalent formulations of the parallel postulate and the ways in which non-Euclidean geometry modifies them.