Hoosier Coal & Oil, founded in 1917, used the above-pictured telephone index as an advertisement in the early 1960’s, and eventually copyrighted the  index in 1965.  The index included not only numerous references to Hoosier Coal & Oil’s contact information and quality fuel, but also useful household advice such as, “Oil Heating Hints,” “Public Warning Signals,” “Precautions Against Tornadoes – Strong Winds,” First Aid,” counterdoses for the ingestion of poison or overdoses of certain drugs, kitchen measurements and conversions, a “Transcontinental Mileage Chart,” information on the value of Social Security Benefits, and the caloric values of some common foods.  It was much more than a telephone index in many ways!