Agricultural Extension Service, South Dakota State College
After you have selected the best phonograph that you can afford, preferably one with three speeds (78 rpm, 45 rpm, and 33½ rpm), you are ready to begin your home record library. Long-playing records withstand rougher treatment than do the 78's, are easier to store, and will play up to thirty-two minutes per side without interruptions. They're not literally "unbreakable," but they are tough.
Sudlow, Adele, "Music and You" (1954). SDSU Extension Circulars. 696.