Breeding Racehorses from Cluster Mares Dennis Craig, 1964, pub. J.A. Allen & Co, green cloth hardcover w/dust jacket. Dust jacket shows soiling, pen mark, chipping and small tearing at edges, previous owner name in pencil and bookplate. Text highlighted in yellow. Laid paper. 183 pgs. This book should be considered the progenitor of much modern breeding theory, discussing the use of linebreeding and inbreeding to proven mares. " . . . only 130 broodmares in the whole history of horse racing in England have . . . produced within six generations no less than 571 out of the 861 winners of the eight most important and valuable races on the English Turf, that is 66% of the total, including 82% of the champion racehorses". Thought-provoking!