There have been african safari hunters before Ruark, but I would describe this book, by "how it all begun" in modern safari.
There are numerous good books, but considering the time frame, and starting to get a first glimpse of modern safari, I would say it is best book on african hunting that I have ever read.
"White hunters" is good book, but it is chronological hystory.
Rooswelts "trails" is good, but it is by now ancient hystory of the era of foot safari. By reading this you are getting the glimps of old african times.
Craig Boddington, his modern Africana books, are all good - if hunter is seaking updated information.
All of the Capstick is good, but mostly outdated. Great read for sure.
Taylor, covers the subject of safari rifles and cartridges, like Wieland and Boddington in related titles, but this is very narrow subject.
But Ruark has caught the spleen of African safari like no other. Very close to Hemigway, but, to my taste better. Reading Ruarks " the horn of hunter" is the closest possible to the real thing. For me, this is the first book to read, to get idea what safari is, and then to read everything else.