Century Schoolbook

Century is a family of serif type faces particularly intended for body text. The family originates from a first design, Century Roman, cut by American Type Founders designer Linn Boyd Benton in 1894 for master printer Theodore Low De Vinne, for use in The Century Magazine. ATF rapidly expanded it into a very large family, first by Linn Boyd, and later by his son Morris. With ATF no longer operating, a wide variety of variants and revivals with varying features and quality are available. Century is based on the "Scotch" genre, a style of type of British origin which had been popular in the United States from the early nineteenth century and is part of the "Didone" genre of type popular through the entire nineteenth century. Its design emphasizes crispness and elegance, with ball terminals, minimalist brackets, prominent slab serifs, and high contrast between thick and thin strokes.

From the Wikipedia article “Century type family”, licensed under CC BY-SA 4.0.

Serif typefaces like this are the traditional choice for book body text: the serifs guide the eye along the line in long passages. Set novels at 10.5–12 pt with 125–140% leading.

Commercial typefaces require a licence that covers embedding in PDFs and ebooks; check the foundry's licence before you publish.