Cocoa

Free to read here, from Project Gutenberg.

The Manufacture of Chocolate and other Cacao Preparations

Paul Zipperer

Cocoa and Chocolate: Their History from Plantation to Consumer

Arthur William Knapp, also an audiobook

Chocolate and Cocoa Recipes and Home Made Candy Recipes

Maria Parloa and Janet McKenzie Hill, also an audiobook

The Food of the Gods

Brandon Head, also an audiobook

The chocolate-plant (Theobroma cacao) and its products

Anonymous