Another fall of 1906 article discussing the changes by Travis (Pittsburgh Daily Post, Oct. 7, 1906). The article seemingly suggests that Travis was almost beating CBM to the punch with the idea of "borrowing" from the great Old World courses, and notes several of the direct inspirations, including the impetus for the railroad tie bunkering.
There is also a bit of coverage on the move away from cross-bunkering. Here, the resulting side of the fairway bunkers were not placed to catch the common miss, but simply remained as vestiges of their more penal predecessors, and seemingly were not moved with much thought to creating choices for the player.
This article goes into a bit more detail on the mounds added to the 2nd, 4th, 9th and 12th greens, identifying those at the 9th and 12th as the most severe. It is of interest to note that the existing green surface was rolled up, the mounds built and then the sod rolled back with the gaps being filled in with sod. The article also touches on the method of play for getting a ball over the mounds, noting one could use a putter but that a mashie "would seem to be the better club."
Despite this article noting that the mounds at the 12th were "really part of the putting green," from the early photos of the hole it is evident that the grass on the mounds was not (and probably could not be) maintained at the same level as the green itself. Later photos indicate that this practice changed, but it was after the 3 to 5 foot high mounds themselves had been softened and altered to a great degree.