An avid book collector in a wide range of topics and a lifelong researcher of language, Easton amassed an extensive personal library of historical pamphlets, scientific journals, and other imprints, including over 100,000 volumes that ranged in publication dates from the 16th through the 20th century. The library finally became so large that he and his wife had a tennis court demolished on their residential property at Toluca Lake in Los Angeles, California, and used that space to build a two-story structure to house the collection.