Most of the old history books our out of copyright, meaning it’s legal to scan them into PDF format and post them on the Internet. Indeed, this is exactly what one unknown person did with the original 1898 issue of Winston Churchill’s, “The River War.” Right now, however, that book has been heavily edited by addition of footnotes and changing formats of printing. Now you can get it through eBay for about $160 for the two volume edition. It’s so well done (I have a copy) that it’s worth the money for any professional or amateur historian.
The River War - An Account of the Reconquest of the Sudan
https://librivox.org/the-river-war-an-account-of-the-reconquest-of-the-sudan-by-winston-churchill/
Of the few short minutes I listened to, it sounded like a really good recording.