The fourth edition of the Encylopaedia Britannica was published in 20 volumes in 1810. Below we link to online scans of these volumes, and indicate what each volume contains.
This is a "meta-book", which stitches together separate files elsewhere on the Web as they appeared in a previously published book. It is subject to removal if someone produces an integrated edition. If that happens, The Online Books Page will point to the integrated version.