La Naturaleza De La Tierra Media - J. R. R. Tol... -

: Listed around $89.10 to $89.98 at Books A Million .

: Focuses on complex calculations regarding Elvish life cycles, longevity, and the conversion of "Valian Years" into solar years. La naturaleza de la Tierra Media - J. R. R. Tol...

(Standard Paperback/Hardcover): Prices vary by retailer, with offers from around $28.22 at AwesomeBooks to approximately $35.03 at Bookish.org . : Listed around $89

: Covers more "earth-bound" subjects, including the flora and fauna of Númenor, the geography of Gondor, the making of lembas bread, and even whether certain characters (like Dwarves or Elves) had beards. Available Editions and Pricing the geography of Gondor

According to Google Shopping Data , prices for various editions range significantly: