A few small bits of information on Abercromby contained in Cornish & Whitten seem pretty enticing, mentioning that "Aber" was considered by some contemporary critics to have created the most natural hazards of his day and to have been perhaps the finest British designer of the era before WW1. It also mentions he was a "free hand" designer, not drawing, just measuring and creating on the land. Other than attribution for an early course in France it seems he worked in the "Heathlands" his entire career. Got his start when his employer (he was a secretary to a financier) was impressed with Sunningdale, Walton Heath and Woking and asked him to provide a golf course. Abercromby initially consulted with Willie Park Jr, and later joined the firm of Fowler, Abercromby, Simpson (Tom) and Croome.
It seems to me that the early "heathland" architecture was and is probably the most significant and of the highest quality of any of the early golf architecture once golf initially moved out of the linksland into England. Of particular significance (to me anyway) is it seems the whole genre of early "heathland" architecture had far more of a natural flair and aesthetic than any man-made architecture that came before it and more than a good deal of the architecture that came well after it.