Spices, their histories
A surprisingly complete and informative 64-page booklet describing common spices used in cooking and for other purposes. Written especially for grocers, but helpful for all interested. - Summary by KevinS
Chapters
From LibriVox, read by volunteers and in the public domain. LibriVox page (opens librivox.org), the text (opens gutenberg.org), all files on the Internet Archive (opens archive.org).