Tractors compete with horses

Paul Witty, Ursula Bringhurst & Barbara Nolen.  The Brave and Free.  Boston:  D.C. Heath & Co., 1952, Revised 1960.  Illustrations by Harve Stein.

From an American school reader of the time.  Insofar as such books reflect prevailing attitudes, it's interesting that there seems to have been nostalgia even in the 1950's regarding the transition from one form of power to another.