Ranked #30 of 32 — easiest first.
The most common words in this book that fall outside the core vocabulary. Names are left out; these are the ones that actually repay learning before you start.
Buck did not read the newspapers, or he would have known that trouble was brewing, not alone for himself, but for every tide-water dog, strong of muscle and with warm, long hair, from Puget Sound to San Diego. Because men, groping in the Arctic darkness, had found a yellow metal, and because steamship and transportation companies were booming the find, thousands of men were rushing into the Northland.
Btelo English plays The Call of the Wild one sentence at a time, highlighting each word as it is spoken, with a tap on any word opening its dictionary card. The full text is also free at Project Gutenberg if you would rather read it straight through.